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Thread: giant impacts, stripping atmospheres making Moons

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    Default giant impacts, stripping atmospheres making Moons



    Giant Impacts on Earth-Like Worlds

    These results suggest that our planet’s impact history — with the Moon-forming impact likely being the last giant impact Earth experienced — is fairly typical for Earth-like worlds. The outcomes also indicate that smaller impacts that are still potentially life-threatening are much more common than bulk atmospheric removal. Higher-resolution simulations could be used to examine such smaller impacts.

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    Default Re: giant impacts, stripping atmospheres making Moons

    So I guess the result of the impacts causes the time necessary for the earth-like planets to form to roughly double. I also find it interesting that less than 1% of impacts are large enough to entirely strip away the atmosphere of such worlds.
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    Default Re: giant impacts, stripping atmospheres making Moons

    Yes, but what is unsaid in the article is that some atmosphere stripping is necessary for life. Compare Venus's atmosphere with Earth's. Getting the right amount of atmospheric stripping is another one of those Goldilocks things, like being where water can be liquid, having a giant impact make a Moon-like moon and not a merger.
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    Default Re: giant impacts, stripping atmospheres making Moons

    Southern third of Hudson's Bay.
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    Default Re: giant impacts, stripping atmospheres making Moons

    Quote Originally Posted by not_Fritz_Argelander View Post
    Yes, but what is unsaid in the article is that some atmosphere stripping is necessary for life. Compare Venus's atmosphere with Earth's. Getting the right amount of atmospheric stripping is another one of those Goldilocks things, like being where water can be liquid, having a giant impact make a Moon-like moon and not a merger.
    Perhaps an over abundance of atmosphere could be a problem, otoh, I read a study today that indicates that atmospheric pressure on the early earth plummeted, potentially caused by nitrogen fixation by early life. In a similar vein, the great oxidation event drastically changed the atmosphere as well. I suspect there are numerous routes to a life-bearing world, of which our own is but one example.
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    Default Re: giant impacts, stripping atmospheres making Moons

    Quote Originally Posted by MCox View Post
    Perhaps an over abundance of atmosphere could be a problem, otoh, I read a study today that indicates that atmospheric pressure on the early earth plummeted, potentially caused by nitrogen fixation by early life. In a similar vein, the great oxidation event drastically changed the atmosphere as well. I suspect there are numerous routes to a life-bearing world, of which our own is but one example.
    True. I won't suspect. I'll wait for more data in the form of a second example. Care to share the study?
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    Default Re: giant impacts, stripping atmospheres making Moons

    Quote Originally Posted by not_Fritz_Argelander View Post
    True. I won't suspect. I'll wait for more data in the form of a second example. Care to share the study?
    I don't have the citation yet, but I wouldn't be surprised if it comes before we depart this mortal coil...
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    Default Re: giant impacts, stripping atmospheres making Moons

    Quote Originally Posted by ThinkerX View Post
    Southern third of Hudson's Bay.
    No evidence of any impact there. https://en.wikipedia.org/wiki/Nastapoka_arc
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