Do you think that great civilizations (of course, alien ones) have come and gone in other parts of the universe?
Have they existed, lived for millions of years, then died out after their sun's light bulb went out? Or are we alone in the universe?
- WhoLv 74 days ago
and possibly THEY were alone at the time - they came and went then millions/ billions years later life on earth came along
COULD be that they "went" maybe just 10 or 100 years before life on earth started
Could also be that a planet orbiting a star we see in the sky had life on it when the light set off
But that life became extinct in the time it took the light to get here
(nothing to do with their star going out- they just became extinct for other reasons
cos of the HUGE expanse of space and the speed of light "time" ceases to have any meaning over those huge distances
It takes light 100000 years to cross even our own galaxy
Far away galaxies it can take billions of years to get here . and a hellova lot can happen in just 1 billion years, even more in several billion years
- Jeffrey KLv 65 days ago
It is very likely that many alien civilizations have come and gone. The number of stars and planets I'd huge. But they probably go extinct for many other reasons long before their sun burns out.
- robertoLv 65 days ago
life here took 4.2 billion years to hatch 2 leggers,,that is how carbon based rascals developed from flippered sea creatures.. other life forms perhaps form as bases for different elements,in super hot,super cold,,dark, lesser gravity conditions,,perhaps,as to the length of time it takes for them to become cognizant,we have no idea,or which other elements this might occur with
- CliveLv 75 days ago
Possibly. The universe has been around for long enough.
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- ZirpLv 75 days ago
questions about the answerer are not allowed on Y!A
- ไม่เป็นไรLv 75 days ago
No one really knows. But they love to make stories and movies about it because it sells at the box office. But in real life why would anyone care. They have not screwed with us so why give a damn.
- 5 days ago
We are alone in the universe. Science has told us that.
Astronomical observations spanning centuries including SETI and it's multi-billion channel radio scans have never revealed the slightest hint of life (let alone civilizations) in space. We are alone as alone can be.
But if you want to cast aside science and indulge in fantasy and speculation, you could note that the vast vast majority of the universe is totally and permanently invisible to us due to distance and cosmic dust clouds. Therefore it is never possible to actually prove that other beings do or don't exist. All we can say is that if said boogers exist, we can never detect them. Therefore in a wild moment of flagrant whimsy we could imagine that great civilizations may indeed have come and gone.
After all, our civilization came, is here now, and due to social mismanagement leading to overpopulation and resource exhaustion, it is very soon to go. Nothing to do with the sun's light bulb. Our civilization, like any unrestrained biological system, is doomed to bloom then crash. And we call ourselves intelligent!!
- CarolOklaNolaLv 75 days ago
Yes, very likely that has happened over and over, or they may have gone extinct or destroyed themselves long before their sun expanded and had a helium flash.
- nineteenthlyLv 75 days ago
Yes, I think there have probably been civilisations for about nine billion years.
- 5 days ago
We are not alone. But our relatives live a long way from home.