Are We Alone? Galactic Civilization Challenge | Space Time | PBS Digital Studios

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1. Is there a link to the animation shown at 2:18?
2. You know in the first minute of the video the drake theory and how is there any planets that can habit life well who said that there are species that are like humans I might sound stupid saying this but there could be a type of species that can adapt to much harder planets like mars and Venus making it much easier to live around the universe
3. what if DNA was engineered and planted on a younger Earth.what if they watched life grow and evolve and have been watching since the beginning.what if they figured dinosaurs were never going to be intelligent conscious lifeforms. what if they did the calculations and determined what size,speed,and location an asteroid would need to be to wipe most of life out on earth and to start anew and let another species have a chance at it
4. background music?
5. I don't think there could have been advanced civilizations very much older than us. there certainly could have been intelligent life, but in the young milky way planetary systems would have been so metal poor that a spacefaring civilization could never have evolved there.
6. Hummm...that's a lot of work for a t-shirt...ehhh---make that a chance at a t-shirt....
7. Everyone thinks of the tabby star discovery as a peaceful thing, "oh it could be a Dyson sphere.", but what if it is an interstellar armada. A fleet of carriers and destroyers, gun ships, etc. No, that would cause panic. The only time we "see" something and it turns out be an alien military sailing through a distant solar system. Better hope it's not the necromungers from the chronicles of Riddick. Lol, let's keep pretending and hoping it's something sweet like a Dyson sphere.
8. A long time ago in a galaxy far far away
9. Could you talk about CCC?
10. Wow free homework!? Actually it does sound fun, but I don't have time for it. So with that in mind I'll leave you all with some extra bonus work or something fun to think about relating to this.
    
    Drake's equation is silly because we don't know much about abiogenesis. The chance for something we don't know about to have happened is one in any number. The only way to get an idea of this is to solve the budding new field of science called abiogenesis. Good luck.
    
    On the other hand we have known for a long time how to build self replicating machines. We have done it to the point that several people have constructed such systems into the game rules of the game of life. This means we can get a arbitrary self replicator complexity estimation in pure math. This is a good thing to include in your paper.
    
    We can also guess a lot about what systems could have the conditions to make machines. The difference between machines and life in this context is purely language and as far as I know no one has bothered to do any of this work.
    
    This means the search for life on other planets is the search for life, that looks exactly like us because shrug, on other planets. That dyson sphere is surely a cluster of intelligent metal bugs that is mildly curious about the growing pollution cloud on the third rock from the sun with no signs of metal bug life. If they come here they will dysoform our sun and kill us before either of us realizes the other is not a freaking rock.
11. This is a GREAT video series! Also, this man has dynamite traps.
12. im sorry. ive heard these arguments often before. if there are aliens out there, then they are remarably quiet. the question of life is simply way outside the realm of such apparent logic. im not impressed by the technical talk. what is an alien if weve never seen one? and if weve never seen one before, then we have to assume there arent any. unless of course one turns up then we can change our mind! (dont keep me in suspense please!) A MESSENGER
13. Amazing video! I liked it so much that i felt i needed to translate it to make it accessible to more people! So i just finished doing the subtitles in Spanish! Hope you like it! Cheers!
14. What if an intelligent species may want our natural resources?
    
    Id like to think that our nukes combined with the most advanced missles possible in the next few decades would be enough to fend off advanced enemy aircraft.
    
    Even if they are superadvanced they would very likely be heavily damaged or destroyed if a few nukes hit their spacecraft, or maybe 100 nukes for a fleet of enemy ships, finally the nukes will be useful.
15. Maybe we are the first intelligent life in the universe..has to be a first.
16. the Drake equation is in acurate- it misses many things such as a stable eniornment with a moon, the right star, placement in galaxy, radiation belt, cosmic ray saturation, drake eq is BS
17. a Percentage of our DNA did not originate from this solar system.
    most of our DNA is liked by all other organisms, but a small percent is not found in our nature anywhere.
    Therefor that percentage originated from outside our solar system.
    Leading to the conclusion that there is other life in our galaxy.
    How that DNA was introduced into our DNA is open to speculation.
18. What is the probabilty that an alien civilization emerged before us?
19. I'm 14. It's such a damn shame I might never know the answer to this question. Oh how I'd love to go to other planets and meet different species.
20. God created and only God knows how old is the universe