Anonymous
Anonymous asked in Science & MathematicsAstronomy & Space · 5 days ago

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?

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  • Who
    Lv 7
    4 days ago

     yes

     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

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  • 5 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. 

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  • 5 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

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  • Clive
    Lv 7
    5 days ago

    Possibly. The universe has been around for long enough.

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  • Zirp
    Lv 7
    5 days ago

    questions about the answerer are not allowed on Y!A

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  • 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.

    • Jeffrey K
      Lv 6
      5 days agoReport

      Don't you think it is an interesting question worth investigating? 

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  • 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!!

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    • Who
      Lv 7
      4 days agoReport

      "Science has told us that." science has told us nothing of the kind _ SETI in reality is a waste of time . WE have only been looking for say 70 years - that means any signals from other life could ONLY have been detected in those 70 years - the fact that none have proves zero

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  • 5 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.

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  • 5 days ago

    Yes, I think there have probably been civilisations for about nine billion years.

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  • 5 days ago

    We are not alone. But our relatives live a long way from home.

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