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Thread: Hw big would an asteroid have to be to destroy all lifeforms

  1. #1
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    Hw big would an asteroid have to be to destroy all lifeforms

    How big does an asteroid have to be to destroy the earth? And how likely is that going to happen.

  2. #2
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    Re: Hw big would an asteroid have to be to destroy all lifef

    Quote Originally Posted by Heroin
    How big does an asteroid have to be to destroy the earth?
    Very big.

    And how likely is that going to happen.
    *points to the moon*
    Already did.

  3. #3
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    13

  4. #4
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    Quote Originally Posted by tuffel999
    13
    OK, I'll bite..... 13?

  5. #5
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    ...

    ^^^ Heh, I was about to ask the same thing.

    postCount++

  6. #6
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    Number of times this has been answered.

  7. #7
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    Quote Originally Posted by tuffel999
    Number of times this has been answered.
    Ahh, I see.

  8. #8
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    Re: Hw big would an asteroid have to be...

    Quote Originally Posted by Heroin
    Hw big would an asteroid have to be to destroy all lifeforms
    This may not be a perfect answer, but according to Charles Cockell: "Perhaps, just under four billion years ago, the Earth could have been hit by asteroids up to 400 kilometers across, forty times bigger than the one that is supposed to have been responsible for the K/T extinctions. Such an asteroid would boil away the oceans and transform the atmosphere into one of steam and molten rock." The resulting temperatures would be "well beyond the upper limit for life and the surface of the Earth would have been baked free of living microbes."

    Source: Cockell, Charles S. Impossible Extinction. Cambridge: Cambridge UP, 2003: 88.

  9. #9
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    Was this before or after the Mars sized one that gave us the Moon?

  10. #10
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    Quote Originally Posted by Kaptain K
    Was this before or after the Mars sized one that gave us the Moon?
    During

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