Habitable Exoplanets | In Search of Earth 2.0
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- Опубліковано 8 бер 2021
- Thousands of exoplanets have been discovered, only a select few show promise. Here we look at some of the most habitable exoplanets ever discovered ranked through their similarity to Earth. The result is a list of 16 exoplanets that could one say serve as an Earth 2.0
Music: / nebula-no-vox-version
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Sources / further reading:
www.liebertpub.com/doi/10.108...
/ when_did_earth_have_th...
harvardforest.fas.harvard.edu...
• SKY & PLANT COLOR ft. ...
www.wired.co.uk/article/keple...
arxiv.org/pdf/1509.08922v1.pdf
en.wikipedia.org/wiki/TRAPPIS...
www.spitzer.caltech.edu/images...
phl.upr.edu/projects/habitable...
www.nasa.gov/ames/kepler/kepl...
www.nasa.gov/ames/kepler/nasa...
exoplanets.nasa.gov/alien-wor...
www.space.com/24142-kepler-62...
exoplanets.nasa.gov/alien-wor...
exoplanets.nasa.gov/eyes-on-e...
exoplanets.nasa.gov/exoplanet...
www.nasa.gov/keplerbriefing0723
www.space.com/30034-earth-cou...
exoplanets.nasa.gov/exoplanet...
• SKY & PLANT COLOR ft. ...
www.centauri-dreams.org/2015/...
exoplanets.nasa.gov/trappist1...
There has to be life out there. Billions of stars in billions of galaxies. Has to be a another habitable world like Earth. Guess the search continues. Or else, the Fermi Paradox is true.
there must be one, but everything is so far away i doubt we will even reach one
I guess no one is crazy enough to thinks about another galaxy. But argument sake, in endless universe there are infinite number of exact copies of Earth with all us on them including.
I don't think the question is if another habitable planet exists. Even if our speed of travel increased exponentially, getting there is unlikely before we become extinct.
the real questions how common are they and if well be able to find them before expansion hides them forever.
Well yes, it has to be out there, but when we make it that broad, it could be the nearest being 3 galaxies over, in which case we would never meet. From everything I see, it seems if there is life at most there are probably somewhere between 3-10 habitable planets in the entire galaxy as most places in the galaxy are totally destructive for sustainability and others are to sparse in heavy elements. We actually have one of the rarest types of stars, we happen to be in one of the less active areas of the galaxy yet occasionally pass through the spirals for extra heavy elements, and we needed a metal rich star in the first place.
So with everything we know, we can rule out life in the center of the galaxy, in star clusters, and any stars of low metallicity. With that we still have a decent amount of the galaxy left though still a large portion of the galaxy are in star clusters which are far too chaotic to be stable. They also need to be in fairly spacious areas as to be far away from super novas, gamma ray bursts from neutron stars, neutron star pairs, and white dwarves. But most importantly, they can't be the stars outside the galaxy or at the very edge as we do still need some heavy elements for life (phosphorus is needed in all life and is one of the more rare elements in the universe).
A lot of people also get caught up in these claims of "life not as we know it" though the elements are identical across the universe so we can kinda assume life must be as we know it as there are only so many strange ways elements can combine and for a majority we are made of the most common elements in the universe. Only exception being phosphorus which is the backbone for DNA. However, considering phosphorus is inherently rare even on Earth, we can tell there probably isn't a more suitable replacement.
*Can't wait for the James Webb to find out which exoplanets have breathable atmospheres!*
2768: Humanity invades Trappist-1 and harvests their atmosphere and liquid water
Can’t wait to find out why all the text you type is in the bold font!
Ja
æ
@Zuwaria Sarafine you’re ignoring how this planet might be very far away and hard to contact, and there’s also the problem of ethics, as a lot of people aren’t going to want to leave the rest of humanity. Plus, there’s no way children are going to be sent there, as they would be leaving their parents.
One interesting thing about the Trappist system (as far as I understand it) is the potential impact of how close the planets' orbits around their star are too each other. Because of this, they likely play on each other's rotations, which may not only produce tides, but also cause them to *not* always be tidally locked, both of which could increase their chances of being habitable.
You have no idea of what you're talking about, do you?
I'm not sure that would be the case. The Galilean moons all orbit relatively close to Jupiter and each other and are all tidally locked to Jupiter. Io, Europa, and Ganymede are in orbital resonance with one another, though, so these planets may also be, too.
the feeling like we're shopping planets is actually nice haha
But what is the price we have to pay?
yea nobody knows...
maybe time to send someone out there to check the best habitable planet out
@@VintageCR there is a video that calculates how much earth would ikely cost
@@yaboi7239 There's also a video out there how to calculate and solve mathematical problems.
But do you here me ask about them?
no.
Sure hope the planetary market isn't as bad as some housing ones. 😂
Trouble is, if any extinction level event were upon us you can bet that all your tax dollars invested into finding " Earth 2.0" would be for the " Elite, privileged, and the politicians not for any of us regular folk.
*arrives at exoplanet
me: those aren't mountains, *THOSE ARE WAVES!!!*
Ruuuuunnnnnnn
not again
"you know what I hate about travel at relativistic speeds? Everyone else gets older, I stay the same age."
-- Matthew McConaughey
I understood that reference
I understand this reference
Mud-planet *has life*
Child: "I'm going out to play!"
Mud-planet *no longer has life*
?
I understand the reference. Baby yoda
haha not these days, they would be inside on xbox confused of what gender they are
Gotta say, I'm digging the space-related content that has been posted here recently just as much as your previous stuff.
Great work, man, keep it up.
yes
Check out Isaac Arthur and cool worlds for similar
You might also like Astrum
Seconded!
@@wahyubudiono9130 Oh well yes in a less "atlassy" way ^^ Good channel.
ParallaxNick as well is excellent
Earth: you took everything from me!
Earth 2.0: I dont even know who you are
I WOULD LOVE A PART 2! This has to be one of the best and well made videos I've ever watched!
x2.
Look up "Space Engine" and fly around the Universe yourself.
Me too!
Agreed. Exogeography is always interesting.
He uses space engine for a lot of footage in this btw
Wait this means Earth is actually Sun1d? 🤯🤯🤯
It’d be Sol-1 C
@@tyger5645 the first planet starts with a B the star is A
Sol-d
Sol D.
@@Xelaria in two star systems I believe the second star takes the title of "b".
Your content is phenomenal. Your level of research is mind boggling to me. I barely graduated high school but the way you explain your topics is understandable...even to me! You're now one of my favorite channels.
This was such a good video! I used to be really obsessed with exoplanets when I was younger, and it was really nice to hear about all of the new one that have been discovered! However some of my favorites were Gliese 667 and Gliese 581 which I think would be cool to cover if you do a part 2! Or maybe include some random/weird exoplants rather than just habitable ones!
im sorry man but gliese 667 and 581 were deemed to be artifacts and non existent
It's all fake dude
Quick correction: Exoplanets letter names are assigned based on their order of discovery. Sometimes that works out to be the same as order from the star (such as Kepler-62), but sometimes not (such as HD 219134).
So in reference to a comment above asking what Earth is, it would not be Sol 1-D, but Sol 1-A.
Since I'm pretty sure we discovered Earth before the other planets lol.
@@EvilParagon4 I am not sure which comment you are referring to, but this sounds like fun little rabbit hole to explore! If we want to classify our own solar system according to exoplanet naming conventions, it would likely be Sol b, Sol c, Sol g, Sol d, Sol e, Sol f, Sol h, Sol i. Here is my justification for this naming scheme: Planets are named with *Star name* and then a lower case letter. Upper case letters are reserved for stars, if the system has multiple. Planet naming always starts with "b", because "a" is assumed to be the star they orbit. The term "planet" comes from the Greek "wanderer", meaning Earth was not recognized as a planet until recent times. Mercury to Saturn where all known since antiquity, so I guess they were all discovered together In that case, their names would likely follow their order from the sun (the sun's name being "Sol"). In that case, Earth was "discovered" after that, followed up by Uranus and Neptune.
@山モﾑ丂モﾚ Letter names are assigned based on their order of discovery. Earth is probably the only planet that was or will ever be discovered BEFORE its star (especially if you don't count the Sun as being discovered until heliocentrism taught us what we were dealing with, but inarguably the first human knew that they stood on something before they knew that something shone down on them). Thus Sol 1-A. ...Or maybe even Terra 1-A, since the name being the star in all other circumstances could just as well mean that the name should be whatever was discovered first, and thus the star in all cases other than ours.
WELL UR BRAINY, REALY COOL****8888****
@@EvilParagon4 Naw we already live in it
Uranus would be
Atlas Pro, your videos are incredibly useful for world-building, especially for interstellar sci fi stories. Keep on making stuff about planets, the ideas that content gives me really spices up the locations in the stories I'm working on
where can I read ur books
Came here to comment the same thing. Ideas for scifi locations are running wild right now!
As a scuba diver, it would be such a dream to dive in the oceans of an alien planet and see what kind of marine life there is.
Detecting multiple leviathan class lifeforms in the region. Are you certain whatever you're doing is worth it?
@@ShihammeDarc I get that refference 🤣🤣🤣🤣🤣
Scuba snack
Bye titan sea 💀💀
Subnautica 💀
I actually really like the longer format, and topic was absolutely fascintating and tackeled a bit differently from other videos on the same topic (with more detail than just listing the planets) sooo cheers for that and keep making such quality content PLEASE
This is why you are the only UA-camr I donate to on Patreon. The quality of your videos is consistently excellent.
Go check out space engine. It's what he's using for the planet scenes. You can fly through the Universe yourself. UA-cam it
I opened UA-cam right on time. Love your videos and the effort you put into them!
Same. Such great content
me too
Yeah lol I finished showering then the notification popped up
So you haven't checked the bell icon?!
@@samerm8657 the notifications tend to be a bit late on the draw. When I saw it it was posted 16 seconds ago.
I never actually checked your subs before today, but it is CRIMINAL that you don't have more subs. Honestly you should be in the millions. You produce the best content of anyone on this entire website. Your production quality is astounding, the information is riveting, and you're great at narrating these.
You're the one that convinced me of the seriousness of climate change and you've also given me a massive appreciation of nature. My new Covid hobby is chilling in trees with my airpods and just looking at the stuff going on around me.
How beautiful ⭐
This was an amazing video! I love your way of explaining the differences and peculiarities of these planets. Really a wonderful video.
Love these long videos. Thank you for putting in all this work
The quality of your videos are unrivalled. Not only were the animations video stellar (haha, get it?), but it was rich with information and detail that I wish all educational videos had. I absolutely enjoyed this video and would love to see a follow-up to this topic of analyzing alien but familiar worlds.
This and the Mars videos are so cool. Love this stuff - interesting and I can't find it anywhere else. Been here since you started, love that your channel has grown this big so fast.
Thanks for putting this together. I more fully appreciate that our habitability on Earth is precious to us and can't readily be replaced.
Yes, its was long but it felt way too short 😭 definitely make a part two of this
28 minutes is a long video? 🤔
@@Brendan-Black with my attention span yes 😂
@@Brendan-Black average youtube video is 10 minutes long
Yes, this was a really interesting video. Thank you so much for continuing to make these, and I definitely look forward to seeing more of your creations. It really helps with my own fictional worldbuilding. There are a couple of videos I have rewatched:
• The problem with Africa's borders (for creating complex realism)
• What did Pangaea look like? (for figuring out climate of different continents);
• How geography turned the Sahara green (for alternative climate and biomes);
• Rename the continents (for more realistic names).
Really love your videos. Such interesting topics, simple yet informative animations and good layman explanations.
More of that would be great! While showing the immense diversity of space, it educates people how special our earth is and that preserving it should be a top priority for mankind.
Atlas Pro is easily my favourite educational channel on youtube, ive been loving the videos over the last couple years, every time i see an upload in my subscriptions i get so excited i grab snacks, fullscreen the video and enjoy the fuck out of whatever im about to watch, and i love space so this video was especially enjoyable. I wish i had these videos when i was in highschool lol
I already immensely enjoyed the geography videos, but space videos are my bread and butter.
Love all of your videos, but these longer length ones are a special treat!
This video is great! Truly love exploring and learning more about other worlds.
Crap one planet and switch to the next. What a beautiful philosophy.
You can do that with women too
@@spikypoo8270 You can do that with companies too
Giving one planet to recover while u crap another lol
@@spikypoo8270 pump and dump !!
@@tomsmith4542 We're all going to make it.
I really love this channel. The quality is so consistent
This is one of my favourite videos to watch over and over! Nice job!
I didn't expect to watch it all, but at the end it felt short! One of your best vídeos so far!
I've spent soooo much of my freetime on researching planet habitbility, star systems and such stuff...
But unlike you, I haven't done such a high quality YT video with excellent explanations.
You should make one. :) Give it a shot.
I would love to see the followup video. This one was fantastic. Thank you.
Excellent video, kudos for the hard work !
Your content is my favorite in the whole youtube game.
Yes please do more videos on this. Absolutely fascinating stuff keep it up champ
born too soon for sure. hopefully we can at least witness mars colonies and the beginning of terraforming
You're just intime to save this earth from it's destruction due to climate change and capitalism
@@Otzkar Ugh..
I know right
@@sneksnekier6764 Capitalistic economies need to endlessly grow, and only care about profit. So, as long as the fossil fuel industry is profitable, it will continue on its path of destruction...
@@warmbabaganoush4825 no capitalistic economy would NEED to grow if it was another mindset going into it. It only needs to be plus-minus zero to function forever. Companies, families, individuals, local governments, global governments, cities. All of these at plus minus zero should be the ultimate goal for any utopia, tragically this would also mean giving up the free will you cherish so much and force society to decide and MONITOR certain factors over time, to steer the economy through outside events (seasons as a simple example, need more heat through winter etc, need medicine in a pandemic or cold season blah blah you know this).
The only reason companies NEED to grow in our current society is because most of them take LOANS and need to pay INTEREST, thus creating DEBT which has to be paid BACK out of fucking THIN AIR.
Imagine a country which a set amount of money distributed evenly between its inhabitants. They'll begin to form services and exploit resources to sell stuff, everybody would have to do that to gain money. If there is someone greedy making tons of money because he can, well, he'll be rich and that's it. There is no stock market, no banks. No way to make rich into SUPER RICH without doing anything by exploitation of the poor. That in turn would mean his business, since he is the richest one, is the one most people are ready to give money to. Sprinkle in a bit of taxation to cover sick or unable people as well as pensioneers, boom, it's great.
Why can we not have this nice thing? Greedy people. Not us normal people. Market systems generating DEBT percentually after time are a CANCER bringing nothing but suffering.
@@ddlc_monika Wouldn't it be reasonable then to implement regulations which prevent that certain individuals acquire unproportionately large amounts of money and power? 🤨
Like, no leaders, everybody organises together?
I completely nerded out in this video. I never learned about mud planets or how oceans can reduce the effects of tidal locking. Nice!
This is probably the best video I have watched. I would absolutely love a part 2!
Awesome vid man! My favourite on the channel yet!
I started watching this before school, and I've been waiting all day to finish it.
YES, PLEASE DO MORE ON THIS SUBJECT. I REALLY ENJOYED IT.
Your animations and representations in this video are awesome!
Love every video
I loved this, and I totally would like to see the rest of the planets on your list.
27:00 'only' 40 light years = 378429200000000 km, the fastest spaceflight recorded was 39,897 km/h. At that speed it would take us over a million years to reach those planets, we'd be a completely different species when we arrived, if we somehow managed to have enough fuel and food onboard.
ikr, people discuss exoplanets like we can reach them with our current speed. We are not reaching any exoplannet until some alien gives us the v69 engine to put on our rockets.
The best chance we have is moon and the mars, that too we are suffering to reach.
As an aspiring astrobiologist, I loved this. Thank you for posting.
Wait, astrobiology is a real thing?
@@grillygrilly Absolutely! There are few job opportunities at present, but it's a fast growing science.
If you would like to know more about it, the Astrobiology Wikipedia page is a good place to start. The NASA website also has lots of resources you can read.
Yes! Please continue with more of this! It’s awesome!
I love these kinds of videos so much (granted, I love most astronomical and (bio)geological videos. They provide so much food for thought.
My math tutor: "You have to study for your final exams!"
Atlas Pro: "I don't think so!"
Why do we need to find another earth like planet if we run out of resources? We could easily just switch to creative mode
IKR
Smh my head
/gm creative
Stfu
@@AneriGS my man just said
“Shake my head my head”
@@zenithchan1646 bro you didn't need to destroy him so bad with those facts and logic. RIPin peace
This is one of your best videos man! Keep it up!
This was an amazing video to have out, keep up the amazing work!
Now this is interesting and relaxing at the same time
27:30 yes! It's better for me to split a long video in 2. Really enjoyed it. Especially loved the visuals and detail for each planet. I can now easily imagine how each habitable planet is unique and similar to each other. Tidally locked, position in habitable zone, color and size of star, terrestrial vs marine and mixed. Also density and composition (so water isn't uncommon?). Plus how a (not too) large planet is beneficial; with a molten core providing a magnetic shield, plate tectonics and volcanic outgassing contributing to the atmosphere.
Part 2 could be great, but now that you've already covered the best (trappist and teagarden), is there more interesting content?
If you disregard the habitable requirement/ideal then there are some very strange exoplanets out there.
For instance "Hot Jupiters" which are gas giants orbiting far closer than Mercury does. Or i believe there is an exoplanet that is basically a giant diamond because it was originally a star but a different star ripped away its atmosphere leaving just the giant jewel. (Note that it is covered in dust and junk so it is not a shiny diamond but looks more like any other rock).
That very short list also leaves off so many theoretical planets like rouge planets (planets without a host star), or interesting hosts like neutron stars or black holes, even if such an object would be short lived or highly improbable.
Planet people ,
One hidden possibility her is that the cores of red-dwarf planets may be smaller than if they were yellow-dwarf planets .
If true , this could be due to differential- stripping of magnetic/paramagnetic materials from the protostellar-disks .
The above would greatly reduce the amount of heat put into these planets interiors , but this would typically be counter-balanced by tidal-heating . The effect of this difference upon convective -cells and plate-tectonics is unknown .
The above , along with slow planetary-rotation , is likely to greatly reduce or eliminate any planetary magnetic-field . The compensatory effects might be a strong induced magnetic-field , and a very dense ionosphere .
The above two effects could act together to mitigate the atmospheric-stripping effect of the host red-dwarf star . This could be considered the exoplanet equivalent of the thermal Leidenfrost Effect .
The implication of the above is that even extreme solar-wind pressure and events , do not necessarily result in the removal of a red-dwarf exoplanet's atmosphere .
Planets such as Trappist-1d have a very good chance of possessing significant atmospheres , possibly containing large amounts of "fossil" oxygen , liberated from water-vapor by photolysis .
*.Support provided below .
To examine this subject in greater detail , go to UA-cam parent company Google and type in... Why does Venus spin backwards .
Go down 10" and search again ; then choose .51 . Concentrate on it's end .
Absolutely fucking fascinating. Your videos have always been extremely high quality, but somehow they're still getting better. And I love the longer vids!
I really like your videos. They're so good I don't even notice the length.
I LOVE these space related videos, and the longer format is great too!
I really want to see another one like this.
i really really love this video, looking forward for part 2!
this is by far the best video on habitable planets i have seen👍👍 kudos
Atlas deserves way more subs
His voice is so sexy lolol 😃
@@yxt8948 yo wtf
This was the best thing I've seen all year, more pls!
I’m liking all these astronomy videos. Another great video!
yes to every video idea. love this channel. love you
Hey Atlas just want to say that this video, and all your videos, are excellent. Some of the best content on this site. Well researched, well written, perfect narration, and beautiful visuals. Your work is awesome.
The sci-fi nerd in me was busy imagining all the possibilities of what we'd find if we're to ever venture to these mysterious worlds.
Lol me either was imagining some stories including those planets.
I was mapping out biomes as he talked
have you seen the show "alien worlds" on netflix?
@@raidermaxx2324 and "lost in space"
@@roku6194 ya thats a good show too.. but "alien worlds" is like a national geographic documentary on a hypothetical alien world, and what possible alien lifeforms might develop on for example a tidally locked "eyeball" planet, in the goldilocks zone of a red dwarf star, and "lost in space" is that re-do of that 1960's sci-fi show... but its done well for sure! just a bit different in context...
This is the best video you've ever done. Please make more.
This is so underrated, your editing is so good!
Note that a lot of people seem to over estimate how red red dwarfs are. They actually vary from nearly all inferred to basically identical to an incandescent light bulb. Though personally I still say life probably is just as uncommon as it appears to be.
In visible light however they'd still be red, wouldn't they? Maybe dimmer depending on the relative amount of energy being output in infrared, but for visible light illustrations red would be the main color.
I've heard that red light of a certain wavelength and amplitude is actually good for our bodies.
@@metametodo no, you underestimate how bright they are. From a distance, they appear dim and red, but they're still stars. They'd still be extremely bright to look at from an orbiting planet, so you wouldn't be able to discern any red color. That majority of red light would just contribute to the dimmer environment, which would have the light levels of a cloudy day.
@@ianmeade7441 At first I understood that OP meant that they weren't all red, but other colors as well. That's what I was trying to grasp on, but now I figure they're talking about estimating their tonality and intensity.
But I see what you mean. If I'm no wrong, I believe our Sun also looks white from space. I think this debate on a star being red or yellow doesn't consider literal eyeball observation from close, but the peak wavelenghts the star emits. Because if you consider all wavelenghts of light emitted it will end up aggregating into something close to white light to the unaided eye.
@@metametodo yeah, that sounds exactly right! I think the imagery of red skies on worlds orbiting red dwarfs comes the fact that most of the ones we've found are tidally locked. For the habitable regions, the sky would actually be a permanent sunset red. But for planets that rotate normally, it's like you said. Our eyes wouldn't notice the mostly red spectrum in the aggregate sunlight
I want to watch this now but I'll save it as a reward for when I finish working. If my 15 year old self sitting in geography class could see me now, she would call me a nerd but I wouldn't care. This stuff is cool.
I postponed dinner to watch this .
This is hitting very different with empty stomach and the aroma of the food.
It's simple, now you can learn whatever the fuck you want. You aren't obligated to learn this motivationless with a unchallenging boring test waitimg you at the bottom of the calendar sheet.
@@pedroivantaveraferreira3037 It really is a kind of freedom. My geography teacher was the most boring person on earth (she had that Margaret Thatcher kind of air about her) and her lessons really zapped the interest from me. I was quite surprised myself when I relearned how interesting this topic is
phenomenal video!! cannot wait for part 2!
Loved this. But then again, I love all your videos
Scientists: name a star teagarden and it has hospitable planets
The British: *New colony ship being launched into space as we speak*
XD
“Living here the sun would be in eternal sunset”
Sounds absolutely perfect for a sci-fi adventure/thriller.
I almost fell asleep. It's not boring or anything, your voice is just so calming
That was an awesome video, I'd definitely enjoy another video like this one
Could we get a part 2? I love learning about exoplanets!
WOO THAT’S WHAT I’VE BEEN WAITIN FOR THAT’S WHAT ITS ALL ABOUT
WOOOOO YEAAAAAAHHHH BABY!!!!
Thanks for this beautifully made and clear video! Up until recently I thought we lived around the 'most normal type of star' and OF COURSE every planet has a day and night cycle. Then I read a book that said that (at least in our Milky Way) red dwarves were by far the most common, and that all its nearby planets are tidally locked. It blew my mind! I still need to figure out how exactly this happens, but I find it fascinating!
Your videos are so interesting, keep up the good work :D
No one:
Kapteyn B: Perfectly balanced, as all things should be
Ah I see a reference
Great video, maybe do a couple of the least habitable planets like the ones where it rains diamonds
I loved this video. Fascinating. Please make more about exoplanets.
This is why I love this channel
Nobody:
Me: Atlas Pro and Kurzgesagt are my favorite informational channels.
Try "Astrum" if you don't know it yet 😊✌🏻
I 💖💖💖💖💖💖💖💖💖 Kurzgesagt!!!
I was thinking about 4546B with a ESI of 1.00, their were similar planets to it
No, those freaking leviathan doesnt make it habitable, dont count me in, i'm staying on Earth
@@Nebo8ful who said earth dose not have them?
@Nebo8 nah planet Earth sucks
THIS is the kind of content that's a sign of a great UA-camr.
Fantastic video. Thanks for making this.
I don't mind the long episodes! It was amazing just like all of your videos!
I don't have "space stuff" subscriptions but Atlas Pro roped me into it!
Anton Petrov is an astronomer UA-camr
So happy to be a patron, your content elevates our species.
Be His Channel Member
I’ve watched this video so many times and it never gets old
@Atlas Pro that was so informative man, I writing a comic book that takes place in space, I want it to be somewhat realistic, I'ma re-watch this video a couple more Times
You should do more space themed videos, it would be really cool along with the normal map videos
Gimme part 2 :o Thanks for the great video
Awesome video! Would love to see the sequel!