Viewer Questions Episode 5

[@JamieSteam]

00:25 Instability of spinning satellites. 03:35 Railguns on the Mun. 05:17 Space tourism. 08:43 Lunar Module control and maneuvering. 10:35 Companies selling land on the moon. 12:00 OneWeb news. 12:26 How did Scott and his wife first meet? 13:29 How do you make so many good videos? 14:35 Bananas, and buying uranium online. 15:50 Astronomy satellite constellations. 18:35 X-15 rocket fuels.

[@FuriousImp]

This should be pinned 👍

[@samuelmeasa9283]

15:40 when we all opened Amazon to see what the price of yellow cake uranium on Amazon is.

[@TheBeardedBoofhead]

16:38 Burp :D

[@ВалентинРазумнов-ц4к]

Dzhanibekov effect should be pronounced as Janibekoff.

[@konstantin.v]

Jenny-back-off 🤗

[@taylorgalilea698]

14:50 Oh hey! I'm an Eagle Scout who got her Nuclear Science merit badge and that is what got me fascinated in nuclear technology, leading to me studying Nuclear Engineering at Texas A&M. It was the person in the position you are putting yourself in for those Scouts that inspired me to go into the field I'm passionate and fascinated by. Thank you for being proactive in that, it was one of my favorite merit badges to show off and I'm sure the Scouts you'll be helping will feel the same. Keep doing a good turn daily Scott!!

[@johndododoe1411]

Does the badge training include anything practical for scouting enemy nuclear capabilities? (I do remember the origin of the scout movement).

[@ofsabir]

14:23 How acurate this statement is! Let's appreciate how Scott's videos have literally no filler content, no bs, and even if they are not scripted they are just heart to heart conversations between space nerds..

[@rasaecnai]

He never asked us to subscribe or like the video.

[@owensmith7530]

@@rasaecnai And yet he has 1.26M subscribers, he's just that good at the unscripted yet filler free content.

[@emrazum]

I like this style so much better than the channels who have 30sec intros and two minutes of just unrelated gibberish before the actual video starts

[@germansnowman]

Some of my favourite channels have started to become more “polished”. I don’t really need this. It must be a lot of work to do all this editing and CGI etc., but if I’m interested in a topic and it is presented well, I don’t need all the fluff on top.

[@bigsherk42069]

Scott should be a director for anime companies bc IM TIRED OF FILLER ARCS Lol

[@chalor182]

Scott Manley, DJ. I can't get over this, it's the best random fact ever. I'd go to a show in a heartbeat.

[@ChevronQ]

Me too 🙃

[@AsbestosMuffins]

seen weirder guys as DJs

[@5Andysalive]

i thought that is the most commonly known private fact about Scott.... Everytime he's asked (in streams) about his one-ear headset he explains the DJ thing.

[@jazzpi]

@@5Andysalive it's also on his channel banner

[@Muamasow]

What is he waiting to begin a podcast? I wanna hear him DJing!!

[@johnladuke6475]

Okay, as much as I want to hear Scott Manley tell us all about linear accelerators on the moon, I think what the people really need is a video of wild stories from Scott's San Francisco DJ career.

[@BlackEpyon]

I want to hear about yeeting moon rocks. I love high-frontier stuff.

[@teaser6089]

Ikr haha

[@thesteaksaignant]

I just can't wrap my mind around the amount of knowledge this man has. The God of nerds!

[@jackielinde7568]

I told you. We don't have a god. We're an anarcho-syndicalist commune. We take it in turns to act as a sort of executive officer for the week. But all the decision of that officer have to be ratified at a special biweekly meeting. By a simple majority in the case of purely internal affairs, but by a two-thirds majority in the case of more--

[@savedbygrace5977]

@@jackielinde7568 God bless you!

[@denomaly646]

The sheer enthusiasm for every one of these questions and the love for knowledge and nerdiness in these videos never fail to make me smile even while still getting smarter from watching these. It's incredible content, no doubt.

[@walter2990]

Thank you Scott, for taking the time to answer your Patreon(?) members questions. I'd love to sit down and have a beer or 10, with you too! I'm not a "mover or a shaker", just an OG who's been a Space nerd since 1962! Fly Safe!!

[@MrHichammohsen1]

This series is getting really good! We need longer unedited Scott Manley videos.

[@duncanhw]

Editing this comment so it doesn't make sense

[@garrettnix]

@@duncanhw It’s probably offset so that the tip of the red thing doesn’t get cut off.

[@duncanhw]

nasa

[@somecsguy9824]

Watch the shuttle lego build. ~10 hours. Enjoy.

[@etherealstars5766]

I wonder, do you get flat earthers frequently replying to you when you comment because of that pfp? Curious.

[@MoonWeasel23]

Forget DJ-ing, Uranium is a fantastic conversation starter at parties. Never know what nerds you’ll find.

[@markiangooley]

I should have bought a whole lot of orange Fiesta Ware dishes when they were still relatively cheap...

[@bee5440]

On god, talking about nerd stuff at parties often ends in me being the center of attention lmao

[@alexsiemers7898]

Or how alcohol is a suitable rocket fuel

[@sumreensultana1860]

@@alexsiemers7898 yeah amazed m3

[@markos.5539]

Cia and FBI will keep in touch

[@nwimpney]

That's the simplest explanation I've ever heard for the Dzhanibekov effect, and it just clicked for me. Previously, I knew that it was a thing, but never really understood why.

[@t.104]

Scott, you can read first three letters in Dzhanibekov as J. Russian doesn't have a single letter for J sound, so it uses two (ДЖ) which then were transliterated as three (D Zh) to English

[@Onizukachan915]

Thanks.

[@yastreb.]

In the contrary, English uses j for a combination of two sounds. There is no "j sound", just [dʒ].

[@Stettafire]

@@yastreb. It depends. It's wrong to say there is no "j" sound because if you ask your average native English speaker what a "j" sound is, they'll all say virtually the same thing. It's a bit difficult however since English is nowhere near pheonetic so trying to line up the alphabet neatly into sounds does not work

[@bnw5435]

I'm learning more from these episodes than I do after hours of googling

[@yes1603]

and school

[@albertjackinson]

@@yes1603 To be fair, school can only go so in-depth. But there are many more factors that go into the quality of your education--what teachers you have, how good they are, how your classmates behave, etc.

[@juzoli]

Because Scott did all to googling for you;)

[@MFritzche]

Generally learn much more from Scott than what many schools can even dream to achieve

[@iveharzing]

@@gamerfortynine Well not while recording, but he got this knowledge in his head somehow... (and yes I know books also exist)

[@jajssblue]

Really enjoying this series! Thanks Scott! Fly safe!

[@lemmingsoutside]

The rail guns in "The Moon is a harsh mistress" are pretty cool. Def something I'd love to read for the first time again. Awesome show SM!

[@mmartel99]

These viewer question videos need more views, they are genuinely awesome. Hearing a ever so slightly more “raw” Scott Manley is always a great thing!

[@grahamrankin4725]

Uranium ore was included in ChemCraft chemistry sets. They included a viewer that had a fluorescent screen to detect the alpha particles.

[@onebylandtwoifbysearunifby5475]

Real chemistry sets had no end of cool things. Kids today are too stupid to be trusted with them, sadly.

[@grahamrankin4725]

Too many personal injury lawyers. Although my original set is long gone, about 12 years ago I bought a nearly identical set off Ebay.

[@Cythil]

@@onebylandtwoifbysearunifby5475 Or maybe parents today are to smart to trust kids with chemical sets from the 50s. Kids back then do not seem to have been that smart. Heck, it was a lot easier for them to eat lead paint chips then it is for kids today. And based on how a lot of how Boomers act today (because yes... these kids are the boomer generation) I would not call them the high of human intelligence. Now I do not want to throw a whole generation under the proverbial bus. There are many forms this generation that is smart to. As there are many from today's generation to. Each generation have to face their problems. And huge part of those problems are what they inherited from the previous generation. I would not let any kid use any chemical set unsupervised personally. No matter how smart or dumb they were. Because I know what I would have done with such a set. Even without a set me and my siblings manage to make thermite after all.

[@onebylandtwoifbysearunifby5475]

@@Cythil Emergency Room doctor folk have told me of myriads of "TicTok challenge" 'Einsteins' who have been severely injured or worse by consuming various items and ingesting truly moronic substances, plus various other behaviors. Add to that: SAT scores have been curved-up multiple times because the average score keeps dropping, so the test keeps lowering the bar. Now, not all kiddos are idgits, I'm just looking at the average of the group there. ("Numbers is as Numbers does." --Forest Grump) (They aren't exactly inventing the computer, or landing humans on the Moon using slide-rules. I wouldn't be in a hurry to compare this generation to "boomers". "Boomers" kicked everyone's a**)

[@Cythil]

@@onebylandtwoifbysearunifby5475 Well if we are talking about kids then kids are not really doing much, are they? Their kids after all. It not like Boomers where landing people on the moon either. At least not when they were kids. As for landing people on the moon. Well seems like we are getting back to that. Then Mars. The question is more political will than it a technical challenge. And do not forget it was the greatest generation that made up the significant part of the educated workforce during the apollo era. Boomers had a lot of great opportunities given to them. At least if we are talking about the American white population. They created a lot of the challenges we today have to fix. I do not see them as some mythical better generation. I see them as a product of the times. And I see a lot of the stagnation we see today as a result of boomers. After all which generation now is it that is in political power? Gen X and Boomers.

[@aneilson]

Love all of the content you put out. So informative, level-headed, and interesting.

[@kipter]

The problem with a linear accelerator on the moon is if it were to fall into the hands of revolting convicts they might use it to declare independence.

[@jeffreypierson2064]

Quit reading! You might expand your knowledge. LOL

[@Anacronian]

"Turns out you can buy yellow cake uranium if you wish..I might get some" Scott sometimes you scare me.

[@TheBillerator]

Don't watch what codyslab gets up to then

[@DrRussian]

Cody's Lab 2.0

[@bknesheim]

@@gamerfortynine Yellow cake is not enriched it is just high concentration uranium oxide that can be used as source in an enrichment process.

[@jackielinde7568]

To be fair, it's not like Scott has the tools and parts to make a nuclear bomb. That requires both a high level of technical knowledge and some specific parts. Sadly, it could be used in a dirty bomb, which is less about actual damage and more about fear and terror. I might want to look at a sample at some point, but I don't need to own the stuff myself.

[@dugundug1336]

uranium ore?

[@jackielinde7568]

Scott, in the book "The Moon is a Harsh Mistress" by Heinlein, food grown on the moon was delivered by a mass accelerator. (I don't know what method was used...) It was also turned into a weapon that smooshed NORAD. But, for that high degree of accuracy, it was completely operated by a computer. But, yeah, that concept has been around a long while.

[@jaychip1]

A self aware computer. Also possibly the first mention of "deep fake" videos for political purposes. All in all, that novel was a masterpiece.

[@markholm7050]

@@jaychip1 I’ve never understood why it hasn’t been made into a movie.

[@jaychip1]

@@markholm7050 well, they tried Starship Troopers and screwed it up. The masses that don't read and only watch movies want the cheap they normally get.

[@dustinweatherby5518]

I love the casual container of uranium ore....and everything else about the video of course! Fly safe!

[@johnladuke6475]

It's not casual, he has it for an important purpose - showing it to children.

[@simongeard4824]

@@johnladuke6475 The funny part is that we only know about the uranium because someone decided to ask about the banana chips... something that most of us would have just assumed was a snack.

[@Zeppflyer]

So, that's even worse than the offers I keep getting to 'Become a Laird! Own 1 square foot of Scotland!'

[@chickenspaceprogram]

ughhhh I hate those ads... seems like every other ad is one of those.

[@jamesharmer9293]

Use an adblocker.

[@johnladuke6475]

Maybe worse, maybe better. You'll probably never have the chance to go to the moon and have the locals laugh at you trying to stand on your square foot of land.

[@charleslambert3368]

you might as well get more than a square foot, what with how land there is dirt cheap

[@Kevin_Street]

At least Scotland actually exists, although they have no right to sell any of it to you. With the star thing and the Moon thing they're selling us a set of coordinates that may or may not be real.

[@markmcculfor6113]

I love these videos!! It's like listening to a podcast where you just take callers and share your awesome knowledge!! Keep doing them please!!

[@declanclaus6681]

makes me happy hearing that you met your wife being a socially awkward DJ. gives me some hope

[@Hotcubcar]

Getting my nuclear science merit badge was one of the most interesting ones. Glad it's still available.

[@greensagan]

Your description of awkward youth is all too accurate

[@jackielinde7568]

Also, don't forget "too familiar"... (Awkward kids unite... awkwardly.)

[@julese7790]

@@jackielinde7568 So true. It's called "coping", some go DJ, some never went to party, etc

[@jackielinde7568]

@@julese7790 some hid in the school's library playing D&D with their "also awkward" friends.

[@julese7790]

@@jackielinde7568 shhh do not mention nor ask about d&d

[@jackielinde7568]

@@julese7790 So, I shouldn't shout, "Roll for Initiative"?

[@RCAvhstape]

About the linear accelerator on the moon: the goal is to launch the payload at greater than lunar escape velocity, so that it goes into orbit around the earth. If you locate the accelerator in the right place on the moon and point it in the right direction, so that the payload leaves the lunar sphere of influence traveling in the right direction, the payload will have a perigee closer to earth, or if shot fast enough, even hit the earth. With a bit of aiming, you could splash down payloads routinely in the same spot in a body of water, such as the Gulf of Mexico or wherever your pickup operation is.

[@AaaAaa-ly3on]

"ZH" = sound "J" without D, so Dzhanibekov almost perfectly will sound as simply Janibekov... ;)

[@nekrugderzweite8298]

Good explaination, thanks!

[@AdrianBoyko]

“Janibekoff” is better because Russian devoices final consonants.

[@SwordQuake2]

Nah, the D is not silent.

[@WeekendWarrior92]

I recently started playing KSP with Realism Overhaul and other realism mods After watching this video I can finally understand why my spin stabilized probes were not maintaining the orientation I've placed them in Thanks 😅

[@adamputz6043]

Astronaut: Houston, where is the engine for us to get back from the moon? Houston: So, your not going back to space today

[@rogerstone3068]

It fell down the back of this guy's bookcase.. sorry about that...

[@Bystander333]

I'm betting a heavily clipped version of that section will end up in a flat earth video at some point. Scott Manley moon expert explains how the ascent module could never have taken off.

[@redwalsh87]

Scott! Please keep us informed about any event you DJ, people would surely show up! Spin safe!

[@feha92]

_"And, it rotates, yuno, like that!"_ Nice pun! Also, are you using principia there? Fairly sure stock doesn't model that dzenikov-effect (and I am entirely sure I read principia patchnotes about it), but there is no mention or textual footnote specifying it?

[@scottmanley]

Why would it not model it given that it naturally arises from the laws of physics.

[@buttersquids]

I think I've seen a video in stock ksp showing the effect in action

[@feha92]

​@@scottmanley Mainly because I didn't know why else principia needed to patch it in (but on second consideration, it might have been in regards to their time-warp rotation). And because I never saw it happen when I used stock. So figured I should ask as I know you sometimes use principia. Then there is also the fact that I am biased and associate stock with forgoing physics in favour of simpler (but still very adequate) models with better performance (ie. SOI, Rails) :p In this case an example would be to have an angular-velocity property for entities (or contraptions) where each tick rotates it around a specified axis by the specified angle. Either way (despite me giving too detailed of an answer to what is likely to have been a rhetorical question :D), I take it your response implies that it is in stock, so thanks for the answer :) edit: found the patch-note in question, was version frobenius, and they call it "Джанибеков effect", but I presume it translates to the same name. Doesn't clearly state if it was only in regards to adding the effect to time-warp, but it _is_ the version that added "continuous rotation when warping", so it probably is indeed the case.

[@scottmanley]

@@feha92 Yeah I know that Principia has some rotation hacks to deal with the game engine only allowing planet rotation in one axis so it might need some special hacks.

[@NavidIsANoob]

kzbin.info/www/bejne/gpjMapWQaZWnfrM Here it is in action (in stock).

[@sproctor1958]

Thank you for sharing your knowledge with us. I also thoroughly enjoyed the personal background on becoming a DJ, and meeting your wife. Stay Safe!

[@TheRealBanana]

Ah good. I assumed the banana chips were a warning. I feel safer now.

[@1959Edsel]

9:40 If you look at photos of the LM during assembly, you'll see that the fuel and oxidizer tanks are the same size. One is positioned farther out because of propellant density, but the tank volume is the same.

[@sampsonike]

I think the rail gun Idea came from "The moon is a harsh mistress"

[@donsample1002]

The idea is much older than that. A lunar magnetic catapult figures prominently in Arthur C Clarke's 1952 _Islands in the Sky_ and I doubt if he came up with the idea himself.

[@JeffreyBue_imtxsmoke]

It's an idea that will come to fruition in the "not too distant" future.

[@sproctor1958]

TANSTAAFL

[@johnmc67]

@@sproctor1958 no such thing as a free lunch!

[@Onizukachan915]

@@johnmc67 if there were, these beers would cost half as much.

[@tsmhd1]

Honestly I could watch this for hours and not get bored.

[@KevinPotter1138]

Good to know, thanks Scott!

[@CurtWatson]

Dr. Sian Proctor is actually the person who helped me realize I wanted to be an aerospace engineer. I met her back when I still didn't know what to major in. Wonderful person.

[@MrGeneralScar]

Is it just me, or does anyone else just wish Scott could be a guest on the live stream the next time SpaceX launches astronauts and just a couple of minutes before launch we get to hear "I'm Scott Manley, Fly Safe."

[@calvingreene90]

One of the advantages of ammonia as a rocket fuel is it optimally burns at a 1to1 ratio with LOX simplifying pump design.

[@zeg2651]

Most common drugs in this community from bottom to top: - marijuana - ethanol (rocket fuel) - KSP - space videos 😝

[@dangleecock6704]

🤣🤣😜

[@Myllypelle]

Weird way to describe my last weekend, but ok

[@alithegeek]

Pott Manley

[@some_haqr]

Marijuana

[@bradswim]

@@some_haqr marihuana is acceptable as well

[@andersjjensen]

Viewer questions are NOT, I repeat NOT, filler fluff. Those were great questions! And great answers! Scott Manly viewers (when properly Scott Manly filtered) are apparently an interesting bunch with interesting things on their minds! :D

[@ChevronQ]

Oh yes please 😌 a video about railguns and the space applications for that 😌

[@ChevronQ]

@@vablo7198 patreon 😉

[@johndododoe1411]

I was surprised that catapult launches from the Moon won't reach escape velocity given all the fresh energy converted from solar to kinetic.

[@georgedoolittle7574]

Point is by adding *some rotation* one is conserving energy based upon the principle of well, conservation of energy (technically conserving momentum?). Imparting spin is a natural result of launch into "zero pressure" in the first instance so I think the technical term is "station keeping" or some such thing

[@Wampa842]

So that's how you came up with the DJ S&M twitter handle.

[@jfess1911]

You mentioned the difficulty getting stable ignition for the ammonia-lox engines on the X-15. I had a college professor (in the early 1980's) who had worked on rocket engines in the 1950's. One day during class he got nostalgic and started recounting the excitement of those days. He mentioned the number of times delayed ignitions damaged the test stands or blew up buildings. He recounted that if the engine did not immediately ignite, it would fill the area with an explosive mixture which upon lighting would, ... well, explode. He mentioned how exciting (and terrifying) it was to hear the phrase " 3-2-1 .... DUCK!!!".

[@maxk4324]

"For a book, which is different on all the axes..." Machinery's Handbook: For now....

[@johndododoe1411]

I don't have a copy. Is the printed version a perfect cube?

[@maxk4324]

@@johndododoe1411 the digital version is larger I believe, but it's definitely approaching it

[@dotsmassacre]

One of the neat tricks we were working on was translating magnetic pulse impaction... with the kinetic driver... so, pulse modification totally necessary...

[@terp2726]

Rail guns on the moon? Try "The Moon Is A Harsh Mistress" by R. A. Heinlein from 1966.

[@jackielinde7568]

You, Too?

[@leflavius_nl5370]

Heinlein made good stuff

[@AM-jw1lo]

The Moon is a Harsh Mistress. Heinlein wrote the lunar mining launch system many many years ago.

[@BeechComer]

many years^H^H^H^H^H decades ago

[@AlexeyBurlakov]

I suppose you could attach a kick motor to the stuff you're throwing off the moon by a "rail gun"

[@AlexeyBurlakov]

And higher you throw them, smaller the kick motor needs to be. If you throw _really_ fast, you can put stuff into an Earth orbit. If you have good aim (i.e. the gun placement and timing), you can put your cargo into an aerobraking trajectory. (see "shooting the Earth")

[@jackielinde7568]

@@AlexeyBurlakov I see someone has read the book "The Moon is a Harsh Mistress". ;)

[@AlexeyBurlakov]

@@jackielinde7568 I haven't. Is it good?

[@owensmith7530]

@@AlexeyBurlakov Aerobraking or lithobraking trajectory?

[@jeffreypierson2064]

@@AlexeyBurlakov Yes. Any Heinlein is good.

[@generic_tylenol]

I wish more people were like you, Scott.

[@nyaefna3322]

hello, have a good day whoever is reading this :)

[@Caspar_Stanley]

Well thank you very much, and to you too! :)

[@isaachenrikson3197]

And of course, fly safe :)

[@DrMegaGaming]

Good day to you too!

[@009Fahim]

A good day to you too friend

[@sprucemaroose]

@@isaachenrikson3197 as always

[@tedm.3961]

Awesome chat. Always learn more than I really need but love it!!.

[@JustJayGaming]

I forgot your name but FLY SAFE !

[@Alex-lc1bv]

It's the channel name

[@DamianReloaded]

5:00 Heinlein's "The Moon is a Harsh Mistress". There they use a mass driver to launch stuff straight from the Moon to Earth. I imagine that the tidally-lockness of the Moon would allow for this almost at any point of its orbit? I wonder how long it would have to be to reach Moon's scape velocity, maybe material for a KSP twitch stream?

[@tuga_ace]

Still waiting for you to found the Scottish space program

[@dotsmassacre]

You are so right about the railgun indiscriminacy... I mean, the 'railgun' that we made 'for' the navy was actually a pulse modified slot driver. You know because it used an energy modulation package... and a kinetic ram.

[@danlewellyn6734]

Did you ever have hair? (From one bald man to another)

[@nagualdesign]

He has eyebrows.

[@kevinshepardson1628]

Another advantage of a linear accelerator on the moon: The moon is tidally-locked with Earth, so you don't need to wait for the correct point in its rotation to launch something onto an Earth-return trajectory. You'd still have to adjust the "muzzle velocity" (for lack of a better term) to account for eccentricity and other complicating factors, but it seems like it'd be an easy way to send mine output (and anything else) back to Earth. You wouldn't even need fancy heat shields - just use mine tailings and/or other waste products as an ablative shield.

[@bryceborgialli5090]

Scott: It turns out you can buy weapons grade Uranium on the internet. Scott: *Smiles*

[@johnladuke6475]

Yellowcake is a long way from weapons grade. It's just ore, not even pure metal, and would take a lot of refining to make it metal like the container he shows off. Which would then need a lot of refining to be weapons grade. Which means you have to start with a LOT of yellowcake and people start asking questions. Just ask Iran.

[@bryceborgialli5090]

@@johnladuke6475 This is why we can't have nice things. It's called a joke.

[@johnladuke6475]

@@bryceborgialli5090 Science channel, even the jokes get fact-checked.

[@bryceborgialli5090]

@@johnladuke6475 Fair enough

[@danielleriley2796]

Rail Guns. Talk about a barrel burner. The arcing between the rail the projectile and the rail again means that the rails have a lifespan of only several shots. Then the entire barrel/rail assembly has to be replaced. I saw this on a doco and it was the gun operator that said this. He said that the rail was by far the most difficult problem to overcome as the projectile design was just a matter of trying a design and observing the results and fixing flaws and the matter of energy isn’t really a problem as the ships that would be outfitted with them were more than big enough to house the generation and capacitor bank required to fire.

[@thomasvanwely]

Whoah, this is the earlies one I have had the oppertunity to comment on. So nothing really, gonna just watch now.

[@mozismobile]

The SKA and MWA are miracles of low-noise design and amplification. The have groups of antennas linked in analogue (they "point" the system by path length switching) to get enough signal for the amplifiers to even work. So each "space array" satellite would have to be quite large - a tile of 16 antennae on a 5m square plate. And you wouldn't be able to link those satellites using radios, or power them using any kind of switch mode supply. So the extension cords back to the base station satellite would have to be quite long.

[@mozismobile]

www.cambridge.org/core/journals/publications-of-the-astronomical-society-of-australia/article/murchison-widefield-array-the-square-kilometre-array-precursor-at-low-radio-frequencies/ED20FE56B17C253DAB94836785D887F0 The MWA signal path starts with a dual-polarisation dipole antenna, roughly a square metre of collecting area at ~150 MHz. Sixteen of these antennas are configured as an aperture array on a regular 4 × 4 grid (with a spacing of 1.1 m). Their signals are combined in an analog beamformer, using a set of switchable delay lines to provide coarse pointing capability. Each beamformer produces two wideband analog outputs representing orthogonal X and Y linear polarisations. This we refer to as an antenna tile and analog beamformer (Section 2.3).

[@marcralfschricker]

There was a NASA esa etc. Wargame for a planet buster event... did not workout very well ... would like to hear about IT.

[@TheEvilmooseofdoom]

I think it was a 118 meter asteroid.. Not exactly a planet buster.

[@jeffreypierson2064]

I agree. Scott is the person to go into depth for us non-engineers. www.jpl.nasa.gov/news/nasa-to-participate-in-tabletop-exercise-simulating-asteroid-impact

[@zackfreeland6420]

Loved this so much, would gladly listen to this as a podcast of some sort, very fun.

[@alexandresen247]

bill nelson was more of a space tourist than any of the actual "space tourists"

[@davidg5898]

14:37 I just assumed the banana chips were there for scale.

[@keysersmoze]

Space training: 1. How to throw up in the space sickness bag. 2. How to mop up floating vomit balls. 3. How to do 1. and 2. simultaneously.

[@andrewhayden2477]

Hahahahahaha! I became the "DJ" in college about the same way you did. Found out recently via Facebook that my mixtapes are legendary among my college friends. Met my wife online many years later.

[@ConnMC]

Scott explains this stuff better than school and makes it more interesting at the same time, Common Teachers, Learn how to explain and make things interesting

[@TheOneAndOnlyMart]

Thank you for your work!

[@benjaminshropshire2900]

If you want to go for long baseline observations constellations; kick them out on solar escape trajectories, say sling 2-4 past Jupiter ever launch window. In optical bands that could give an order of magnitude increase in baseline for stereoscopic depth measurements in a few years, and in radio bands (you will need a big dish for communications anyway) you could even do synthetic interferometry with a huge apertures. Get things out far enough and you might even be able to measure angular velocities via Doppler.

[@nate0031]

Your "shoddily produced" videos are perfect. I hate it when someone turns a 2 minute video into a 15 minute video by adding intros etc, talking about their day, showing themselves doing some errand etc. It's real nice that you just get into what the topic of the video is, and basically all the time of the video is spent giving useful or interesting info.

[@jason.stevens]

Jonathan McDowell said on nsf live that the higher altitude satellites like one web are actually worse for astronomers because they get get caught by the sun easier and so are brighter, as well as having a lower speed at higher altitude, resulting in them being more "in the shot" for longer

[@jaychip1]

That interview was the best I have ever watched on the internet. Jonathan is a brilliant, nice man.

[@PhilfreezeCH]

4:45 Isn‘t there some fancy trajectory that could use the gravity of earth to replace the necessary circularization burn?

[@tycho6503]

Unfortunately not - without any energy exchange, it's impossible to change your orbit. Gravity assists work by 'stealing' a little bit of velocity from the body (such as the moon, or another planet) to alter your orbit without having to burn fuel.

[@stijnvanpelt]

@@tycho6503 Depends where the cargo needs to go I guess, but you could shoot at lunar escape velocity and then perhaps a trajectory that goes through Earth atmosphere or into solar orbit.

[@cokeforever]

The story is so sweet ) Future Missis Manley: "that'a groovy track... who was that?" Scott: "1200 Micrograms." MM: "So, you wanna hit some acid?" Scott: "Sure"... several universes later in a tent lit by moonlight, we can hear Astral Projection playing on mp3-player, our heroes holding hands looking at stars... MM: "We could have named her Skye" Scott: "...yeah, and the boy would be Orion" ;) Bom Psy People!

[@bazedjunkiii_tv]

good to see vinyl in use in those dj pictures... props from germany from a fellow music enthusiast.

[@adriankoch964]

@Scott Manley Which one was your DJ name? - Bloom - Oliver Orzal - Wrong? - Caltrop - George Holland - V-Dub - Lisa Fox - S&M :-)

[@Forest_Fifer]

The last one, based on his Twitter name...

[@ztechrepairs]

Love these. So much awesome jam packed info

[@stephenirwin2761]

Love your videos! And your answers.

[@jthrush]

@4:55 An object launched with a railgun would crash back to the landing point - but only in a one-body system. In the Earth-Moon system it should be possible to select a trajectory off the Moon which uses Earth's gravity to slingshot the payload into a (semi-)stable orbit.

[@NavidIsANoob]

This man really said "Here's some fluff" and pulled up with a whole bottle of uranium ore.

[@Lagul_4]

13:19 - *Yung Manley*

[@kylestubblefield3404]

Robert Heinlein, "The moon is a harsh mistress" Great book that has a mag catapult that sends goods to the earth using small ships with retro rockets to drop them into ocean.

[@wouterdevlieger1002]

Those geiger counters, do they max out on 'not great, not terrible'?

[@jeffreypierson2064]

The expensive ones are locked up.

[@kingtutthefirst]

Very cool that KSP simulates the Dzhanibekov effect/Tennis racket theorem/ intermediate axis theorem!!!

[@KertaDrake]

A linear accelerator on the moon is a good idea. You just have to remember to stick some engines on the projectile so it can convert it's launch into an orbit once it has enough altitude.

[@edrdnc6706]

RE: combining optical data gathered by constellations of small-sats to replicate a large sized optical mirror. The methods used to image "The" Black Hole picture, called for merging data from several radio telescopes . Such a vast amount of data was needed that wire transfers weren't practical. They had to ship actual hard-drives from each site to where all the math was done. And the calculations there also took a long long time, all for just a few images.

[@htmagic]

Scott, a bag of potash fertilizer is also radioactive. And in Oak Ridge, TN we have landfills here that are really radioactive! lol

[@owensmith7530]

Genuine Brazil nuts are more radioactive than ones grown elsewhere. The selenium they take up from Amazon basin soils is slightly radioactive.

[@bautistamercader4737]

Peopke: oh, why do you have bannana chips. Scott Manley: Oh, because URANIUM

[@jayxi5021]

The axis with minimum moment of inertia of the book is the diagonal and not the height of the book 1:12

[@fredbloggs5902]

That’s not a stable axis.

[@johnjay7822]

@3:21 Interesting. So that's why a mallet/hammer flips if you spin it on the long axis. Always wondered that.

[@cravenmoordik]

My wife got me that same Lego LM model for christmas. I LOVE IT!!!

[@veryveryboss]

The dj story is so funny, so glad you shared that one

[@laptop006]

Shuttleworth tells the story of doing actual sysadmin work on the station as while he was up there they were having trouble with a Solaris box, and he of course had a background with that, although he wasn't allowed to actually help.

[@oystercatcher943]

I love the story about DJing. Being strongly introverted and awkward at parties and liking music I can relate. However I would find it difficult to the play the dull music other people liked and so not get asked back!

[@heaslyben]

"Except for this one." LOL, that really got me.