Life in the Universe #4: Planets Are Everywhere

[@Jenab7]

For each exoplanet confirmed to exist by the transit method, there should be about 100 other exoplanets that orbit their stars in such a way that they do not transit. The probability P that an exoplanet will transit its star, as seen from Earth, is given by P = (2/π) arcsin(R/r) where the arcsin has been returned in radians, R is the star's radius, and r is the orbital distance of the planet from the star. Strictly, the formula is an approximation. The formula that would be perfectly accurate (for Euclidean space) is considerably more difficult to derive, so I made use of the fact that the arcsin and the arctan are nearly equal for small angles, and the fact that the distance of the star from Earth (d) can be neglected because d>>r, and the term containing arcsin(r/d) is zero, for all practical purposes. If the planet is in the habitable zone, and the star's mass is... 1.00 solar mass, then the probability of transit is 1/338. 0.50 solar mass, then the probability of transit is 1/121. 0.25 solar mass, then the probability of transit is 1/72. The odds of transit improve as the planet's orbital distance gets smaller, so planets too hot to be habitable are more likely to transit than are habitable planets or too-cold planets. There are 1930 confirmed exoplanets within the field of view of the Kepler space telescope (as of 8 Jan 2016), among the stars bright enough to be seen by Kepler. So there should be at least 200,000 exoplanets among those same stars, with most of them being unseen because they don't transit.

[@bwunukey]

yay , your back with your aswome space videos, i love how you narrate

[@colinp2238]

I agree with you that we are living in the golden age of astronomy but unfortunately I am at the latter part of my life but I console myself by remembering that I have lived through every majoe evnt in space exploratiom from Sputnik to TESS including the Moon landings.

[@anonymousSWE]

I find it absolutely mindblowing that there are people finding out how to do all this.

[@blahblah2556]

+anonymousSWE Yep... but then there's Islam, go figure??

[@Mishimized]

+tony lloyd The levels of ignorance and knowledge in Humanity are extreme :/

[@Randomvideos3200]

SPACE VIDEO!! MAN I MISSED THESE

[@tsjoencinema]

Old school video. Love it.

[@OscarS123]

I'm so happy you posted a video up I miss your Friday updates like you used to do back in the day

[@donniedavis6853]

There is nothing better then putting on some Bose headphones and listening to Tony's voice talk about space. Mind blowing!

[@trevorthompson6155]

I didn't know about TESS till now. This news makes me happy.

[@thulyblu5486]

+Trevor Thompson FanTESStic!

[@davidsddd8982]

+Thulyblu someone had to make that joke

[@thulyblu5486]

Swimming Fish I was just TESSting... _> ...

[@Zharderstyle]

I think that there would be billions of earthlike planets in our Galaxy. How many there will be in our hole Universe?

[@gbevans1991]

It's about time! I miss these videos. PLEASE make more.

[@rocketeer6713]

These kind of videos are why I subscribed. Awesome info. Awesome music. Awesome narration.

[@NorthernStar1776]

I love Tony Darnell! Great video as always! !!

[@ajkorras]

Nice video. Thanks for sharing.

[@claytonkrumm143]

Videos like this remind me why I love the Universe and my place in it. Great job.

[@Peggenhetti]

Love that you are back! Great video! Thanks a lot!

[@richarddavies8004]

Great. Well produced and well presented.

[@donniedavis6853]

Best space voice ever!!!

[@gkbhai8962]

Wow, awesome video!

[@BuddyLee23]

You should do a video on the "great attractor". Curious to know more about it.

[@jackeysmith19]

I really hope they find alien life even alien bacteria in my life

[@dv82lecm62]

Yeah, you just gotta know. Amirite?

[@samuelrothenberg2225]

Actually you don't wanna find bacteria life. Haven't you watched part 3 on the great filter??

[@jackeysmith19]

Samuel Rothenberg no i havent, but i do want them to find life

[@samuelrothenberg2225]

+jackeysmith19 the great filter states that if we find life than the great filter is ahead of us which means life is common in the universe thus technological civilizations generally do not make past a certain point. They either destroy themselves or get wiped out. Trust me we do not want to find life that easily. I suggest you watch the part on the great filter.

[@jackeysmith19]

Samuel Rothenberg Yeah I defiantly will later. I would still like to see that alien life is real though if there are advance aliens they might be so far away they will never find us or maybe they aren't like us and they wont go destroying everything.

[@ITRIEDEL]

Wow the sun shield telescope is so exotic looking. Awesome.

[@CoolHandsShadow]

Thank you!, been waiting for another one of your video's

[@jvdduyn]

can't wait for the James Webb space telescope, that thing will blow our minds just like Hubble did in its time.

[@TTillahFK]

I miss space fan news :(

[@thulyblu5486]

+TTillahFK WHEN IS IT COMING BACK?! :(

[@deepastronomy]

+TTillahFK Space Fan News is coming back in mid-November. Lots of changes and new content coming. Watch this channel for new content and follow me on Twitter for live Periscopes about what's coming: @DeepAstronomy

[@thulyblu5486]

Deep Astronomy AWESOME! :)

[@thenewvoice8]

+Deep Astronomy that is the best news I've heard in a while! looking forward to it Tony.

[@TTillahFK]

Deep Astronomy THANKS TONY! STELLAR NEWS (A little pun intended ;)

[@lucidmoses]

Nicely done.

[@Linandemma]

Even though I saturate myself in all things space on you-tube, I've just learnt some amazing facts that hadn't sunk in until you just explained it all, thank you so much :-)

[@IamNicolai]

You're back!

[@communist-hippie]

nice :) always happy to see a deep astronomy vid

[@davidmcfadden1763]

Best voice on the internet.

[@KCarver]

Nothing really new if you keep up to date with astronomy new & info, but damn, what a great vid!

[@paulpeterson5938]

Great Vids. Number one youtuber in my book. thanks

[@anthonyhall7019]

Absolutly one of your very best videos! I kept say ohhhhhhhh! Or whoaaaa!

[@-_Nuke_-]

AMAZING documentary... I hope we will have found life before I die...

[@haydenray4303]

I'll be going into college right when all this is gonna be happening, it's gonna be exciting since I am majoring in astrophysics.

[@Mishimized]

This Channel deserves at least 10 Million subscribers. :/

[@Franckydap1]

1:30 Kerbal Space Program soundtrack in ;)

[@tauceti8341]

Exoplanets are freaking awesome!!!! I love exoplanetary research so much.

[@Xingmey]

i like how you used the kerbal space program music in the background at arround 2:00 ^^

[@tylero8595]

The narrator has such a pleasant voice

[@EyesWideShut60606]

Will we find Life else where in the next 1000 years? Or within that?

[@dolcettdoug]

So no Moon Maidens?

[@rrookie28]

Your videos are like pink floyd's music there's such a presence in them.

[@GlobebackyardBlogspotTV]

Tony Darnell, the Spock of Space Vids.

[@dv82lecm62]

It would be serendipitous if we each found we are alone amongst each other before we collectively find we are not alone amongst the starry void.

[@rayzorrayzor9000]

It seems that the “Holy grail” of space exploration is to find “Life”, but why ? Isn’t the universe itself full of so many mysteries. Will it really matter if we find life or not . As an animal we are “Special” in our own right, NOT finding life elsewhere makes us “Really Special”, not just humans but all life on Earth .

[@RickKasten]

Bring back Space Fan News

[@jonathanhenriquez9964]

the universe makes me happy

[@Maggieismydog]

I watched a documentary about Mars having surface radiation from nuclear fallout. Possible that a civilisation destroyed themselves and the planet a very long time ago?

[@MichaelClark-uw7ex]

In a galaxy full of population I stars, there is an abundance of heavier elements so an abundance of planets should be expected. We are starting to see exactly that.

[@soifrane]

I agree there might be many planets like the earth throughout the cosmos. But is it OK to be so affirmative saying " there are ". Maybe we should wait till find one ...?

[@dv82lecm62]

Seriously, did we only infer their existence until '92, or did we have no idea about how the disc around the Sun in the early solar system might even work?

[@aducksecho]

space fan news!

[@joshuaparry9919]

G

[@isncc1701]

Kerbal Space Program music.

[@l.clevelandmajor9931]

Folks, as exciting as all this is, I feel that very soon we will see that life either did or does exist on Mars! I think our man here with Space Fan News should do some research about this and make a video concerning it. He could start with the fact that flowing water has been found just under the surface of the sand, and that has been confirmed! It is not water that we would be able to survive on, but extremeophiles can live in many types of water.

[@thefrub]

Alright man, if you're making space videos on KZbin, people are going to recognize the Kerbal Space Program music

[@jbanerje14]

5 years later

[@sokoleoko6539]

amazing thanks :)))))))))))))))))))))))))))))))))

[@CivilAviation1]

I really wanna know on what level science and astronomy will be in 200-500 years. In the last 200 years human kind and the ways we can study our universe has made a huge leap. Too bad most of use (if they don't find a way to make us live even longer) won't be around.

[@anonymousSWE]

+CivilAviation1 This is exactly what I said earlier today when discussing science with a friend. That the most annoying thing about death, is not being around when they discover and invent things that by todays standards will probably look like magic.

[@thulyblu5486]

+anonymousSWE People 100 years ago might also have said that. What might the people say in 100 years? "Oh we discovered everything in our peaceful global utopia... now it's boring, I'll killmyselfbye!* die * " .... or will they say .... "oogah oogah... roooaaarrr" * throwingRadioactivelyContaminatedStone *

[@CivilAviation1]

Thulyblu We might never know

[@Firestorm12345678910]

+CivilAviation1 Too bad most of us (if they don't find a way to make us live even longer) won't be around. The reason why everyone dies is because we are stuck being human beings. It is simply not enough to imagine oneself as an immortal (ie having an immortal soul/spirit/life force etc) because our imaginations do not compose us. The brain (including the rest of the body substrate) must be re-engineered (detouring from the 'blind' forces of biological engineering) physically instead of imaginatively in order to achieve physical immortality. Imaginative immortality can only last as long as the physical brain is alive and is able to create such a scenario. With an eternal existence comes the venue of eternal experiences (or at least until the universe "dies").

[@CivilAviation1]

Firestorm12345678910 I agree, but I just can't rule out to 100% that we (all humans on this planet right now) will be dead in 150 years. Although very unlikely, one will not be able to know if tomorrow or any day in the future, there'll be a way to make us live that long.

[@PTNLemay]

Wow, that TESS thing is really exciting. I love these relatively small-scale NASA missions, like Kepler or New Horizons. They show that you don't need need manned vehicles or dozens of billions of dollars to evoke awe and wonder at our universe. "Just" a few millions of dollars can do it. lol

[@rammstone9233]

Ice is everywhere , so it's likely to have liquid. Volcanic activerty can turn ice into h2o.

[@bdsf1]

Just like downtown.

[@samuelrothenberg2225]

Actually. You don't wanna find bacteria life. Remember the great filter?

[@KalimaShaktide]

3 flat earthers downvoted this video

[@georgebaidoojr]

👌🏿👌🏿

[@selangkirputih8370]

😐

[@Balgore8]

So whats the plan when we find life somewhere else? -immediately invalidates all abrahamic religion on earth -send them a message which will presumably take hundreds to thousands of years depending on the distance -wait? lol