8. Catastrophic Impacts in Earth's History

(February 2, 2010) David Morrison, NASA Lunar Science Institute, discusses the discovery of the cretaceous catastrophe that caused the last mass extinction and explains NASA's research on the danger of similar events occurring in Earth's near future.
Stanford University:
www.stanford.edu/
Stanford University Channel on KZbin:
/ stanford

[@lisabuss8260]

I love this man. What a beautiful, gentle, friendly, plain speaking non condescending soul. Two thumbs up.

[@Atanu]

Lisa Buss: Very well said. I couldn't agree more with you.

[@jeffreystreeter5381]

I 100% agree. What a nice person

[@mountainmanws]

I enjoy listening to a level headed and learned professor discussing science and separating in an intelligent manner science fact from science fiction. Thank you, Stanford, for posting.

[@michaeldonohue8015]

what a wonderful lecturer. simple easy to comprehend. well done. cheers from Michael Australia.

[@toLothair2]

Randall Carlson talks about the Younger-Dryas from every angle. He looks at mythology, geology, and puts together the pieces like a puzzle. He had a great show with Joe Rogan-606.

[@Mrch33ky]

Part of the problem with people believing fantastic stories on the internet is the lack of logical thinking that is taught to them in school. I was fortunate enough to take a symbolic logic course as an undergrad in philosophy but I don't see it being taught to science majors (or anyone outside of philosophy) and it certainly isn't a requirement to graduate with any kind of bachelor's degree in the US, not to mention a high school diploma. If you're not teaching people to think clearly and evaluate arguments you can't be too surprised when they are easily swayed by the plethora of fallacious arguments that are peddled on the internet. PT Barnum was right about a sucker being born every minute but I don't see the US Education Establishment lifting a finger to prevent people from being suckers their entire lives. So is that a conspiracy or just a room-sized elephant of an oversight? Some cynics have proposed that a dumb population is easier to manage because they have no ability to change the status quo. What say you, Ivory Tower?

[@pharmboyjoe]

"BINGO!"

[@brianjacob8728]

the last major extinction event was the Younger Dryas impacts 12-13 kya, when the megafauna of that era all died out simultaneously, including the Clovis.

[@rishabhkapoor6542]

I would really like to thank Stanford for posting all of these amazing videos on the net for free access worldwide. Their videos are among the best out there!!

[@jackleripper3482]

I Always appreciate people’s opinions especially those who give their own time . 👍🏻

[@jackthompson6192]

Even if it was 9 years ago, I am just now getting this video,, so I appreciate it and you telling me about all of this.

[@elforeigner3260]

Geology puts everything in context

[@chrisdixonstudios]

Great lecture! The evidence of cosmic impacts ending the ice age 12000 years ago is mounting. Have not catalogued the entire Ort Cloud nor how frequently a Shoe-Maker-Levy will miss Saturn, Jupiter and be trajected from Ort to earth orbit. The new Infrared observatory finds more NEOs.. Not to scare but to prepare because we care and can do something about it. common knowledge of natural sciences and cosmos are not concerns of 'modern' culture. Thanks to good teachers we are learning more every year!

[@disbderyk]

What an amazing teacher! 👏

[@stevengoodwin8011]

Ben Davidsons "Suspicious Observors" has a Cosmic Disaster series that does a great service in these areas.

[@jerryplenda381]

Yes, but Ben would be ridiculed by this man. Suspicious0 promotes a 12000 year cycle of near extinction... Probably caused by the Sun... Micro-nova.

[@jamiewilson2088]

This was an amazing lecture! 10/10! Really enjoyed this👌

[@AdamSteidl]

13:00 don't forget the mass extinction of megafauna in the northern hemisphere at the end of the last ice age, or the mass extinction in the southern hemisphere about 25000 years ago.

[@Barbreck1]

Actually 11,600 years ago.

[@kenlieck7756]

I can't even remember the Alamo... and I just visited it six months ago!

[@Barbreck1]

@@jhndwtt But God isn't your witness.

[@yourstruely9896]

greenland impacts

[@TheHelghast1138]

The K2 boundary consist of a span of time that is roughly 500,000 years, while yes the impact did lead to the extinction, it was NOT the primary reason. Also, there were at 2 possibly, 3 impacts around this time. Infact we found the second impact in Ukraine. However, the real death happened from the mass volcanism in India CAUSED by the impacts produced from magnitude 10 earthquakes shocking the Earth. Heck the lava came out so fast it didn't even interact with the mantle, and covered an area the size of California. You can go to India and see this for yourself. Also, this is equally important, according to the fossil record, Species were globally falling prior to these impacts and volcanism. Overall, these factors combined to cause mass extinction and thus lead creatures of all types to evolve into modern ones. Modern birds ARE dinosaurs btw. Also there was not a global firestorm, regional yes, but not global, the evidence does not support this. A simple example would be things like tree frogs. A global firestorm would have wiped them out. The mammals would have died out too. The real killer in every mass extinction was global pH levels in the ocean that changed due to catastrophic conditions that created radical changes in the atmosphere, which the ocean absorbed. Thus allowed the conditions to be right for the bacteria that ruled the Earth for billions of years to re-emerge, and it's waste product is hydrosulfuric acid, turning the oceans pink/purple. There is overwhelming evidence to support this. Sadly the current PH levels in the ocean are once again headed to the levels of previous ecological collapse. However this time, it is humans that are driving this change via pollution. Just remember, nothing in science is EVER linear. Simple explanations are easy, but rarely, if ever, correct.

[@spike.strat1318]

The K2 boundry? K2? would that be the ski wear company or the mountain in asia?

[@shanejarvis1108]

CurbsideUnderwood mate, you blew it with the K2 boundary.

[@conpanidis3574]

Sorry, recent articles published have proven the volcanic activity had subsided and world was recovered by the time of impact. It was republished in The Economist magazine just a few months ago. Sorry I can't quote the exact edition. 🙏🙏

[@blip1]

Folks like this guy are who really keep us safe.

[@rogerdudra178]

I am pleased to see NASA accepting the premise of extra terrestrial objects that can alter Earth's life cycles.

[@msquared6695]

When he said “who knows that if the dinosaurs lived another 650 million years that they wouldn’t have developed intelligence like ours” or something to that effect,well if Dinosours became birds and some birds like ravens are as intelligent as a young child then in a way the dinosaurs have lived on to evolve into birds with intelligence likened to ours if only at a very limited level

[@nibiruresearch]

Thanks to geologists and Mr Morrison we think that all living things on our planet have the most to fear from an asteroid impact. But when we look at the many horizontal layers that we find everywhere on our planet, we clearly see the effect of a repeating cataclysm. These disasters are mentioned in ancient books like the Mahabharata from India and the Popol Vuh from the Maya. They tell us about a cycle of seven disasters. Certainly, a cycle of regularly recurring, thus predictable but inescapable global disasters cannot be caused by asteroid impacts. The only possible cause is another celestial body, a planet, orbiting our sun in an eccentric orbit. Then it is close to the sun for a short period and after the crossing at a very high speed it disappears into the universe for a long time. Planet 9 exists, but it seems to be invisible. These disasters create a terrible natural cataclysm with much flooding and a cycle of civilizations. To learn much more about the recurring flood cycle, the re-creation of civilizations and its timeline and ancient high technology, read the e-book: "Planet 9 = Nibiru". This book answers many of your questions about our past. It can be read on any computer, tablet or smartphone. Search: invisible nibiru 9

[@fredrickjoseph6545]

Wonderful lecture...the Prof is humble enough to acknowledge a lot of uncertainties about the earth history...

[@cornifron]

Hes just regurgitating shiite learned from indoctrination. Now he is the indoctrination master

[@filiili8173]

Your cynicism @@cornifron is easily validated. We just need to hear you case. Then we can add that to the archives (maybe)

[@kim5754]

Good speaker! I like the way he says dinosaurs

[@MrJashuaDavies]

sign of a great elder scientist "dina-sawrs' where the youngsters say dino-sores

[@Xandufarr]

Dr. David Morrison is definitely a treasure. I just watched all this vid, and every bit of it is valuable. I particularly enjoyed the last twenty minutes, because it potently attacks irrationalism. I will sleep well tonight, but we should never rest. We must always develop the ability to defend ourselves from legitimate dangers.

[@binra3788]

Your reply suggests an irrational alignment with sacrifice under priesthoods of the promise of the power to save us. For sacrifice read loss across the spectrum of our human commonsense, commonwealth and commonality. Belief in protection set against denied but manipulated fears works a protection racket - but nothing will induce a recognition of deceit while the payoff is flowing. 'Nuclear winter' - of nanoparticulates in the atmosphere - is not a greenhouse effect - but a cooling effect - associated with cold and dark and famine and plague. The ability to fund global dominance in space works under the agenda of saving humanity from a great threat. Always the great Threat is used to condition allegiance and support for a fundamentally mercantile crusade. The manipulation of the rational is called narrative framing. Of course I am not suggesting hysteria be the power beneath rational or irrational decisions, choices of acceptance. Velikovsky brought catastrophism back into the public attention but as both a new mind to read the mythic past and the geologic and cosmological record. While he made many mistakes he opened a way that has not been closed regardless his being denied by 'scientific' elitism. But his primary goal was recognising denied consciousness in humanity as a whole that operates a re-enactment of its separation trauma to its own destruction - as in the emerging 'star wars' that is only about the marketisation and weaponisation of space - under guise of a greater human Good. Where would we be without a truth to mask in? Who decides what are legitimate dangers? Who gets the funding and consolidation of the ability to set the narrative? Who pays? Most of what are considered terrestrial 'impacts' were likely plasma discharge events. The thunderbolt was not terrestrial lightening and nor does the worldwide symbol of the thunderbolt resemble lightning. Everyone is free to accept whatever they choose but having accepted an idea they will see in its framing until the framing itself is brought to a conscious awareness.

[@brianjacob8728]

@@binra3788 Agree. This kindly "grandfather" motif telling you that your gov would never lie to you and will take care of you (as you pay for their dominance) is a worn out canard at this point. There are plenty of examples of their lies and responses when they guard their protection racket. The first part of this lecture was somewhat interesting, but the last part was pointless. He also didn't have any answers to some fairly obvious questions. Is this really what we are getting for our tax monies? Better to dismantle nasa and the national security state and live freely than to be extorted to support this crap.

[@ricktoffer01]

The Deccan Traps had started killing off the Dinosaurs millions of years and the comet impact was the coup de grace. The worse mass extinction of all was the Permian extinction and that was by the Siberian traps. Now, most mass extinctions have LIP ( large igneous providence )events tied to them. So far only the K/P boundary has this evidence of impact. The other four do not have that evidence. There have been other huge impacts that didn't cause mass extinctions. So please update your data on new evidence of these extinctions and redo your theory.

[@TheHelghast1138]

Thank you!!!

[@rhythmmethod4153]

Fabulous! - common sense is making a comeback!!!

[@alangardner8596]

A very interesting talk, I loved it.

[@righteousred723]

This was awesome, thanks for letting us listen and watch

[@1MarkKeller]

Sitchin didn't start the 2012 doom and gloom predictions. Other people have taken his work and used it for their own purposes.

[@ignominius3111]

What ever they may be. But for sure they are nefarious and malicious without a shadow of a doubt those , those , false Sitchinjackers.

[@1MarkKeller]

@@ignominius3111 Pisses me off to no end seeing the number of people living off his work. Most don't even acknowledge Sitchin, but maybe that's a good thing ... For Sitchin's legacy.

[@zapfanzapfan]

Well, 2012 came and went... did it manage to kill off the conspiracy theorists?

[@Xandufarr]

This man is a treasure. I hope some of his students actually get it.

[@michaelryd6737]

They wont...

[@MrJashuaDavies]

was really amazed by the statement around 5:20 that viral biomass outweighs the microbial biomass. I already 'knew' the microbial biomass outweighs the multicellular. I shared this tidbit on social media and a friend responded with a link showing that all this is incorrect. Plant biomass is the highest, microbial is substantial but most definitely in second place, and all the viral biomass is just a percentage. so... yeah. I'm not qualified to dispute the statement, but my guess is that this speaker is using a cumulative estimate of geologic timescale? as in, microbes have been around for FAR longer than multicellular, and probably the earliest life, SRCM (self-replicating complex molecule) might have included a lot of what we now describe as virus? Curious why this statement that viral biomass is potentially larger than multicellular and microbial biomass included the phrase 'some people believe' ... yeah that was me for about ten minutes!

[@Atanu]

Mr Jashua Davies. You are right in your suspicion that the claim in the video is wrong. Here's a PNAS article that is of relevance from June 2018: www.pnas.org/content/115/25/6506 Quote from the abstract: A census of the biomass on Earth is key for understanding the structure and dynamics of the biosphere. However, a global, quantitative view of how the biomass of different taxa compare with one another is still lacking. Here, we assemble the overall biomass composition of the biosphere, establishing a census of the ≈550 gigatons of carbon (Gt C) of biomass distributed among all of the kingdoms of life. We find that the kingdoms of life concentrate at different locations on the planet; plants (≈450 Gt C, the dominant kingdom) are primarily terrestrial, whereas animals (≈2 Gt C) are mainly marine, and bacteria (≈70 Gt C) and archaea (≈7 Gt C) are predominantly located in deep subsurface environments. We show that terrestrial biomass is about two orders of magnitude higher than marine biomass and estimate a total of ≈6 Gt C of marine biota, doubling the previous estimated quantity. Our analysis reveals that the global marine biomass pyramid contains more consumers than producers, thus increasing the scope of previous observations on inverse food pyramids. Finally, we highlight that the mass of humans is an order of magnitude higher than that of all wild mammals combined and report the historical impact of humanity on the global biomass of prominent taxa, including mammals, fish, and plants.

[@Atanu]

@Sal Lopez Isn't the internet amazing! First one gets to learn all sorts of interesting subjects from awesome scholars. Dr David Morrison is wonderful in his scholarship. But if an expert slips up on some fact, even non-experts can do a bit of digging on the internet and find something useful. Kind regards. Atanu

[@zillionz]

Excellence in information...

[@brianjacob8728]

If Shoemaker-Levy 9 is any indication, there were probably multiple impacts at the K-T boundary. There is an impact site in Utah that dates back to 65 mya, and it's possible that the impact that created the current Yellowstone hot spot in what is now NE Oregon may date back that far as well.

[@sharonseal9150]

Which crater in Utah? I do not have one of that age on my list.

[@ronroberts110]

I absolutely agree....

[@chrisnizer1885]

Thank you for posting this. In addition to being a great lecture, it's a tribute to common sense.

[@thomascassler9494]

you mean buttox !

[@backthisway]

what about the mass extinction 12800 years ago

[@kurtisengle6256]

Google Randall Carlson and Joe Rogan (who interviewed him pretty well).

[@hermanvanniekerk1270]

Read his definition of a mass extinction.

[@yveslaflute9228]

Quackademics say: a hoard of VERY HUNGRY human travellers ate all the mammouths, and piled all the bones. Why cant we get them on the Comedy channel? that would make a good skit.

[@mstalcup]

@Dan Wright That's a correlation for sure, but not causation. Megafauna had survived many wild temperature fluctuations in the past. Why would a temporary reversal in a climatic trend cause such a devastating extinction to most of the largest land animals? There must be additional factors involved. One candidate idea is that modern human diversification and expansion is the major cause. There are possibilities that a cosmic event might have irradiated the Earth. Also, large impact craters in Greenland under the ice, just recently discovered, may date to this period. We don't know yet exactly when these impacts occurred, because looking under the ice presents with many challenges.

[@ricktoffer01]

LIP event Columbia flood basalts and man.

[@jackthompson6192]

I appreciate the truth you are telling us ..

[@apumasterp]

?

[@gregggoodnight9889]

I thought that Venus is so hot due to intense atmospheric pressure at the surface, not due to the greenhouse effect. You can apply the ideal gas law and very precisely explain the surface temperature. Am I wrong?

[@sirrathersplendid4825]

Gregg Goodnight - It’s a mixture of the two: pressure & greenhouse. Even so, conditions on Earth have never and could never get anywhere close to those on Venus.

[@groverc.loweiv8987]

I have been looking for this video for years now...

[@tombrandt8137]

This is a very uninformed presentation since there was a mass extinction event 12,000+ years ago at the younger dryas boundary.

[@mikewilliams4717]

@Tom Brandt technically the extinction at 12,000+ was not considered a mass extinction

[@josephjohnson3738]

Most branches of science today, not only finds themselves in tall weeds, but they now live there solely. The weeds of inferrences, speculation and (so called) educated guesses, and then treating all those as discoveries. It's quite pitiful, actually. This new horrible way of persuing scientific truth, started about 100 years ago.

[@Forsage237]

reason the earth environment has remain suitable for life over billions of years is the Gaia hypothesis which is the idea, put forward by James Lovelock, that living matter on the earth collectively defines and regulates the material conditions necessary for the continuance of life. The planet, or rather the biosphere, is thus likened to a vast self-regulating organism

[@buzz-es]

Need to update and add a few minutes on the Younger Dryas impact.

[@lc285]

buzzkillean - Younger Dry as is not agreed by all scientists.

[@buzz-es]

@@lc285 Nothing is agreed by all scientists.

[@professorsogol5824]

David Morrison is a co-author on this paper "Younger Dryas impact model confuses comet facts, defies airburst physics" (2013) www.ncbi.nlm.nih.gov/pmc/articles/PMC3831451/ Having read the paper, I would characterize it as "skeptical."

[@denemessina8601]

@@professorsogol5824 awesome, thanks for the link.

[@thetruth6585]

@@professorsogol5824 there probably was no airburst there's a decent chance that the impact crater has been found under the greenland ice sheet. That's why the physics models don't fit. It wasn't a airburst.

[@mrpieceofwork]

Please explain the "80% found"or whatever I always see or hear mentioned concerning asteroids/NEOs... Is it because the total mass is known? It always confuses me how they seem to know how many they HAVE'NT found.

[@mrpieceofwork]

LOL I paused it to type the above just before he explains it!

[@kenlieck7756]

I hate to tell you this, but you didn't exist until he pretended there was someone out there asking that question...

[@mrpieceofwork]

I was going to turn this into a time travel joke but you didn't like it.

[@donnysandley6977]

I'm just amazed 😳 and I want to understand more 🤔

[@matthewperry5121]

Great lecture

[@thomaseliason8376]

The "long count" is roughly 26,000 years and it's based on the Earth's rotational precession... and yes, it started over again on Dec. 21, 2012. That's because the Earth/Sun aligned precisely with the center of the Milky Way galaxy.

[@bizzybgful]

keep talking !

[@thomaseliason8376]

Well, it *is* pretty extraordinary that a culture from virtually prehistory, would know about precession and the geometry of the galaxy itself. The change in the visible starfield due to precession is about 1 degree every 75 years. This renders it essentially unobservable over the course of a human lifetime.

[@craigmorris559]

I hadn't associated 2012 with precession. Makes a lot of sense. What's your thoughts on the age of the sphinx? Or the pre incan megaliths?

[@thomaseliason8376]

The Sphinx, Maccu Piccu, Puma Punkhu and Gobekle Tepe are all pre-flood constructions. I would only be guessing as to their exact age, but the odds are good that they were built somewhere around the Younger-Dryas... in order to send a lasting message to a future civilization about their existence (and downfall). I suspect that previous high civilization was tens of thousands of years old at the time of its collapse. I also suspect their kind of technology was very different from ours because of the obvious ease with which they manipulated stone - neither hardness nor sheer size seem to have been any sort of problem for them.

[@betsybarnicle8016]

@@craigmorris559 It's said that the Sphinx, a lion, faced Leo when it was carved around 10,500 or 10,700 B.C.

[@torputube]

Had me up till this - @ 52:29 "There is nothing out there like what did in the dinosaurs..." " we are just about at the point where we can say there is nothing can produce an impact winter".

[@mangeygypsynunya6451]

nothing like it out there????????? stick ya head back up ya own arse ya moron.

[@torputube]

@@mangeygypsynunya6451 Appears you may have missed the quotation marks .

[@brianjacob8728]

Yeah, he's wrong on that one.

[@maromarcinko8632]

Great lecture, thank you!

[@rubenjames7345]

I wonder how much success scientists have had in predicting major volcanic eruptions. The Permian Triasic Boundary mass extinction was caused by volcanic eruptions in the Siberian Traps system.

[@trimetrodon]

Ruben James There is a circular structure beneath Wilkes land, Antarctica that has both gravity and magnetic anomalies associated with it just like the largest lunar craters. This structure might be a crater. And, based on this paper, see link below, the impact - may - have taken place at the P/T boundary: www.mantleplumes.org/WebDocuments/BasuPTScience2003.pdf If so, the Siberian Traps might be antipodal to the P/T ground zero, and thus, the Siberian volcanism might have been induced by the giant impact on the opposite side of the planet. Similarly, the Deccan Traps in India curiously bracket the K/Pg extinction and may have been antipodal to the Chixulub, Yucatan impact site. It is thought the Deccan volcanism began before the Yucatan impact, but nevertheless, the nearness in time and proximity to the antipode makes one wonder.

[@matthewstone1362]

@@trimetrodonwould the shockwaves converge on the antipodal site of the impact?

[@trimetrodon]

Matthew Stone According to modeling done by Mark Boslough at Sandia, shock waves from an impact are somewhat focused at the antipode. The antipode of the K/Pg impact probably rose and fell by tens of meters due to the impact.

[@matthewstone1362]

@@trimetrodon ty for the reply.

[@trimetrodon]

Matthew Stone Most welcome.

[@chadtrump7009]

Great speaker

[@quantumcat7673]

About the faint young sun paradox, when the Earth or Mars was young it was much warmer internally than now and there would have been more volcanism injecting greenhouse gases into the atmosphere that must have been thicker because of all those volcanic emissions.

[@55sjm55]

So there is platinum in the Yucatan?

[@shanejarvis1108]

Stephen Mercer no, there’s platinum in the little layer of debris left after the impact 65 million years ago. If you want to go and mine it, good luck, the layer is only about 15mm thick over most of the earth.

[@tomzeman5964]

I find it quite fascinating how prophets of the distant past can predict events with such conviction you'd swear they were there! Mass extinction violates the principle of uniformity on which evolution was erected to contradict the Genesis 7:11record of mass deposition when all the fountains of the great deep BURST forth a global event now conveniently forgotten!

[@janetbratter1]

Tom Zeman “FOUNTAINS OF THE GREAT DEEP BURST FORTH”? ? Would you like to clarify? Or are you using the Bible as your most valid record of geological/biological events? I have not memorized the Bible, the Koran, the Bhagavad Gita or the Egyptian Book of the Dead which all posit more falsified myths than Hollywood. But I do know that I prefer the attempts of science to clarify and investigate than the ruminations of **“protein deficient nomads” who composed the aforementioned books. ** to quote the famous atheist, Madeline Murray O’Hare.

[@richardbunt2278]

Hey am back to listen to here some more Sir INTERESTING AGAIN.👍👍

[@robertstephenson5897]

Up to 2:46, would Mars lack of significant magnetosphere account for earlier warming and eventual loss of atmosphere?

[@superluminal3602]

This guy is so cool... You can tell he's a great person

[@wowwowwow185]

there was one that exploded over Russia last year

[@BurnRiderZ99]

Very interesting!

[@bhimraochikte5899]

u are Buddha..... one who enlightened.......... hats off

[@melvinshelton8448]

I agree with the applause for the sspeaker.Making something this complex and convoluted sound simple and straightforward is harder than he makes it look. I'll check - I hope he has, or will post something else. Thanks to the speaker for the epicurean talk, and to whomever was responsible for posting it. M.D.Shelton, M.D., Ph.D.

[@cold-639]

its so dangerous and scares me that this man who worked for nasa has no idea of what really goes on and gullibly believes anything he hears. the man here in the video left out the interesting more feasible info that we wouldve benefitted from had he been more complete or as i call it more truthful

[@batcollins3714]

@@cold-639 take off your tin foil hat.

[@sarcasticmaniac628]

Wait a minute, They did build an underground city at the Colorado airport with tax payers dollars, and it does house millions.🤔

[@TheHelghast1138]

That airport is freaky scary

[@jackkessler9876]

I would like to ask an astrobiologist: Is it possible there was more than one genesis event on earth? Could there ever have been separate contemporary biotas competing? Could there have been separate biotas existing at different times in earth''s history? Could separate biotas, if there were more than one, be regarded as a taxon higher than kingdoms?

[@zapfanzapfan]

Anything is possible, we don't know how life started on Earth or even if it did start on Earth. Maybe we are all Martians who hitched a ride on meteorite 4 billion years ago. The only thing we know is that all life we have investigated is part of the same tree of life, we are all DNA-RNA-protein and are all related, that's why we can take one of our genes and put it in a bacteria and the bacteria produces "our" protein like it was one of its own.

[@jackkessler9876]

@@zapfanzapfan If you are right, that bodes ill for the hoped-for ubiquity of life in the galaxy. If in four billion years life only arose once on this planet, biogenesis may be quite rare. Which sucks. Or it could be that DNA-RNA life is merely the last biota standing of several that arose. Our ancestor molecules may have simply eaten their rivals.

[@frankligas2249]

Thanks for the questions. All questions are intelligent questions. (Note: your question is not aligned with this video's theme, but all questions are welcome.) ---- There is logical fallacy in your first question. The logical fallacy comes from the common use of English in your question. The word "event" is not correct. Substitute "transition" and look at your question again. The words "on earth" are also not correct. During the transition to life, much of the activity involved events not on Earth, and in interactions of Earth and Space. ---- Language and concepts you will want to know: "Geochemistry transitions to Biochemistry with time" "Biochemistry leads to more Biochemistry" "Biochemistry = Life" "Geochemistry = Death" "Transitions are bidirectional at times" "There never was a single genesis" "All major religions are weaponized religions" "Challenging weaponized religions yields consequences" ---- A good start for further learning can be found in these two videos. ---- "McCloskey Speaker Series - New Theories on the Origin of Life with Dr. Eric Smith" // kzbin.info/www/bejne/ZpTap51mjad-oqc ---- "The Origins of Life: From Geochemistry to Biochemistry" // kzbin.info/www/bejne/eZa5nGyveJWSrM0 ---- To answer your second question: Yes. In Astrobiology there is a much more sophisticated taxon than in use in common scientific circles. ---- This other taxon includes non-corporeal forms of life as well. ---- Again, thanks for the questions.

[@jackkessler9876]

@@frankligas2249 I am not sure what the relevance of your riff on religions is, but thanks anyway.

[@frankligas2249]

@@jackkessler9876 Friends have been murdered. Challenging weaponized religions yields consequences

[@Barbreck1]

... and then Oumoamoa came along and changed everything!

[@Barbreck1]

@@jhndwtt It forces us to realise that there are objects that can pass through the solar system and wipe out Earth before we know they're coming. "God" has fuck all to do with it, and celestial mechanics cares not one jot whether humanity survives or not.

[@Barbreck1]

@@jhndwtt I agree. We could be wiped out at any moment. Quite why you require to plead to some "God" over it, I don't understand but that's your issue. I'd rather support efforts to either defend our planet from these risks or to get us off it and into space.

[@Barbreck1]

@@jhndwtt Apologies. I mistook you for someone who wished to communicate something worth reading.

[@kenlieck7756]

Don't look at me. I thought Oumoamoa was a Grateful Dead album...

[@tricksterpirate5499]

Very interesting. Thank you.

[@stevesims2243]

we think that non sequitir conflated with appeal to authority which adds to the conjecture called post hoc, ergo procter hoc, is enough to fool the average academician.

[@helenlauer9545]

It's called a hypothesis, Steve. Get over it.

[@stevesims2243]

@@helenlauer9545 get over what?

[@warriordragonify]

Is there a temporal cluster of Lunar craters corresponding to this impact?

[@michael636336]

Add the close approach of rouge planets

[@jefferywise1906]

What of the butterfly effect? A passing interstellar object moves through the solar system and disturbs the asteroids. The balance of orbital stability changes for a few. That affects others .... a new paradigm of chance disturbance send a one gift wrapped to us. ... you'll be busy recalculating

[@lc285]

jeffery wise - Perturbation ripple.

[@bodinski100]

@randall carlson...over to you sir....

[@MrTrenttness]

Great talk!!!

[@mikecummings6593]

I thought I read somewhere once about what was called snowball Earth when the Earth was frozen solid I

[@montymartell2081]

It's funny I haven't watched this and I don't think I will but it's 11 years old everything he's talking about has been outdated isn't science wonderful 👍

[@Overupsidedown]

You haven't listened to it but everything he's talking about is outdated? Do you even listen to yourself?

[@Fatababei]

Proud member of the flat universe society

[@richardturner5594]

Surprising that a Stanford lecture would call the K/T Extinction Event Sixty Six Million years bp as the last one . I guess this was before the YDB Event was considered an Extinction Event even tho do many species went extinct world wide ! Even if they did blame Paleo humans for all the carnage !

[@fz1000red]

It's unfortunate this lecture is nearly ten years old, because I would have loved to have a persuasive argument or debate with this NASA employee. Why? Because he's not telling the truth about several things that he should know, or may be lecturing with information that wasn't thoroughly vetted first. He should know that Zechariah Sitchin's lectures never included claims he alone could read and understand the cuneiform writings on the many ancient clay tablets found by archaeologists. Sitchin said he was one of about two hundred people who could read and interpret the many ancient clay tablets. Even someone who has never been an archaeologist can purchase books dedicated to the reading, writing and understanding cuneiform writings. As for the Mayan calendar, he should have known better than to claim it says anything about the world ending in 2012. Hopefully the guy has corrected himself and his lecture material. The Mayan calendar is not a predictor of anything but the passage of time. It shows the planet has a lengthy and repetitive cyclical nature between so-called "ages". Hopefully he has corrected his content.

[@1MarkKeller]

Sitchin never said anything about the end of the world coming in 2012. He did discuss the Mayan calendar in a few of his book and spoke about it just being about cycles of time.

[@fz1000red]

@@1MarkKeller indeed. To me it's the most ridiculous interpretation of the Mayan calendar to call it's last recorded date a predictor of the end of our world. That's about the same as some archaeologist far into our own future locating a randomly created calendar, depicting someone's favorite sports team, bikini models, or military aircraft and calling the last date shown the end of the world. Of course we would have to get one printed on sheet metal, laser etched or some other everlasting means of creating the permanent document.

[@archibaldtuttle8481]

Maybe I need to get his email list and sell those people tickets to ... somewhere...

[@ergonomover]

Great talk, too bad old Vredefort crater wasn't mentioned, largest confirmed impact crater. Some experts now think the Permian extinction was due to a giant asteroid hitting Antarctica (unconfirmed crater). Also not mentioned, NM2002, for a near miss asteroid in 2002, it was 1.4 kilometers, spotted late. Since this video, there has been the Chelyabinsk 2013 airburst.

[@ergonomover]

On the contrary, various genuine experts (easy to find on the wiki Permian page) think an asteroid may have provoked the volcanic activity and other attributed climate change-related causes, we have a giant crater just he right age off the Falklands ( DOI: 10.13140/RG.2.2.35234.79049 ). Crustal subduction initially masked the crater and eroded any global sediment layer. The subject was giant rocks falling from the sky, Vredefort was (perhaps) the biggest, much bigger and there might not have been any microbial life left.

[@ergonomover]

@Pierre LeDouche: Genuine experts such as CL Rocca et al continue to search for evidence to 1. confirm the Falkland basin is an asteroid crater 250 million years old and 2. that it played a role in the Permian extinction. You are quite correct, we don't need an impact hypothesis to explain the Permian, but if the timing coincides with an impact much larger than Chicxulub, we may just be talking about multiple, interactive processes. I'm no Dr Doom, but am intrigued by the dynamic of low probability / high consequence of asteroid strikes. Keep educating folks, I think talking about it is important.

[@ergonomover]

@Pierre LeDouche: Good grief, there is much paranoia, delusion and wilful ignorance here, stay strong! I've been 'debating' young earth creationists, samo samo. Shell shocked by the intellectual dishonesty after years of it.

[@konradcomrade4845]

in 34:45 that dinosaur-meat was readily fried and grilled and then deep-frozen for conservation purposes! real, effective, prepper-stylish!

[@m.j.debruin3041]

Earth is growing.

[@TheRealPDizzle]

I heard this as well.

[@donnabailey947]

Eridium was laid down because of a cataclysmic event. Why is there only one layer?

[@Mrbfgray]

How could there be more?

[@shanejarvis1108]

Donna Bailey one event = one layer. It’s not that hard to understand.

[@250txc]

Very down to earth video with science and common sense mixing. The later part was ESP enlightening and a little comical. This fellow reaked with wisdom with science backing up his words.

[@rascallyrabbit717]

how about a blight on cereal crops that prevents reproduction for several years or the loss of bees

[@geofflowther2458]

No thanks.

[@betsybarnicle8016]

1. If 5G and Starlink laser communications kill off the birds. 2. If Fukishima continues to kill off life in the Pacific Ocean. 3. If GMO foods continue to comprimise our bodies and kill bees. 4. If CERN creates a black hole that destroys our globe. 5. If scientists unleash a world fatal plague from unearthing a now-frozen ancient carrier body. 6. If a sizable meteor hits the moon or earth. 7. If scientists keep f'ing around with animal-human chimeras. 8. If an NEO triggers the ring of fire volcanoes and earthquakes.

[@Aluminata]

three coughs a minute is more than ENOUGH

[@livingood1049]

Wish I could have been there to ask him what are the chances of weaponizing asteroids but he seems to have retired...

[@wmgthilgen]

The thing about catotrophic event's is. Though they do effect the majority of the planet and the various civilization in the area of their wrath. They do not effect the entire planet. Meaning assuming there is an intelligent biological life form that existed prior, there would in the area's that were not effected to the degree the rest was; Survivor's. Those that managed to survive would for obvious reason's, have to adapt to an primitive life style simularly depicted in the book's and movies we refer to as SYFY. The one thing they could pass down to the following generation's, beside's how to eek out a living by hunting, gathering. Are the stories which eventually become tales and then myth's and ledgends. Simular to those we have today.

[@brianjacob8728]

Berkeley old timers need to get over themselves. Nobody cares if some inconvenient fact made their careers irrelevant. IMO, from dealing with a few of their students they produced in grad school, they were already irrelevant...

[@123Goldhunter11]

Could apophis hit us with an electrical discharge? Some of these bodies can act like huge capacitors.

[@lizardywizard]

what about the dying off of the huge mammals around younger dryas - does that not yet have a place in your story?

[@mangeygypsynunya6451]

this was made ten years ago. the younger dryas dramas werent concluded back then.

[@mcawesomest1]

We are still finding asteroids and meteors within just a day or less warning....

[@patricknoveski6409]

Thank you for common sense sir.

[@davidwilkie9551]

The opposite of crazy. Thanks for the sky scan, ..why isn't it a military defence priority? Another item on the list of things that don't make sense..

[@BRADH-xw8sw]

Most fossils are less than 1Byrs old - that's interesting... what was happening on Earth 1-3.5bil years ago?

[@jorisboulet3619]

singel cel life

[@carlosoliveira-rc2xt]

He said the asteroid strike didn't affect the oceans yet I have read studies that claim it turned the oceans acidic.

[@Sueezedtight]

Venus gets it heat from atmospheric PRESSURE. A warmer earth with more atmosphere when the sun was "weaker" but getting stronger and during its "micro-novas" it was (and still is) stripping off our atmospheric pressure. Mars had more back then and with an even weaker magnetic field, it has now lost almost all of its atmosphere and is quite cold.

[@MellobotX]

I have been to NASA Ames research center in 1990 or so :)

[@yourstruely9896]

what he doesn't tell the dinosaurs went extinct over a long period before and after. not all overnight.

[@bardmadsen6956]

At 27:00 "They (the dinosaurs) were all killed without warning, not doing anything bad to deserve it." Unlike when we almost get it, it is original sin. Wonder what David Morrison thinks about the Younger Dryas Impact Theory.

[@Impaled_Onion-thatsmine]

And I sent them to you twice the first set were incinerated

[@deejames6371]

First of All, fantastic talk!.... Was the 65million Year Old Cataclysim caused by a "Localized Meteoric Impact" or "Solar/Stellar Plasma Blast"?

[@ricktoffer01]

Decan Traps a flood basalt event and impact was the final stress.

[@Shawnkells]

Not too cheap!

[@anthonysimon4991]

If you have studied Pre-Colombian 100% Agrarian Cultures with their myths and legends, Physics, Geology, Procession of the Equinox, actually done Stone Carving with Steel Tools and Metal Smelting, tried to move a 1500 lbs. object without Chain, wheels or Steel Levers or steel cable (not rope made of Llama hide), Solar Cycles and Inter-Glacial Periods, then the Maya Calendar of "The Sun" makes perfect sense to end hundreds of years into the future on 12,26,2012, to mark the beginning "Cooling", the most destructive natural cyclic event. Trust me you would not spend that amount of time and energy, carving stone that hard without extremely well thought out and planed precision execution except to tell a story, a very important story to a culture 100% dependent on Agriculture.

[@blackhatter3991]

Don’t think so