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Thread: Objects from space????

  1. #1
    Join Date
    May 2018
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    Objects from space????

    hello.
    question: if an object, like an meteorite, hits the earth...
    how can we tell if it was from space originally?

    are there chemical tests or some indication that it had been from space?
    as well as metal that may have been in space for a long time? How could anyone tell if something metallic on earth had been in space for long periods?

    what if some scientist/archaeologist digs up metal on earth and claims it had been from some UFO craft, what could someone do to debunk this claim? or prove that claim?

  2. #2
    Join Date
    Jun 2005
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    Quote Originally Posted by dashelwinter View Post
    hello.
    question: if an object, like an meteorite, hits the earth...
    how can we tell if it was from space originally?
    Others may correct me, but I don't think there is any particular marker that shows that something is a meteorite. It's more like this: we know that many meteorites are iron. So if you are walking in the middle of a sandy area, mostly silicon and aluminum, for example, and then you come across a hole and at the bottom of the hole is a lump of iron, then you are pretty sure it's a meteorite.
    As above, so below

  3. #3
    Join Date
    Dec 2001
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    Here's a decent article that discusses how to tell if a rock is a meteorite or not.

    https://geology.com/meteorites/meteo...fication.shtml

  4. #4
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    Aug 2006
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    Quote Originally Posted by dashelwinter View Post
    are there chemical tests or some indication that it had been from space?
    Yes. Rocks not from Earth have a different composition of elements and isotopes.

  5. #5
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    I remember reading about a rock that was traced to outer space because it had traces of argon that were primarily of isotope 36. The argon on Earth is mostly isotope 40, a beta decay product of potassium 40. Apparently this rock had somehow retained measurable traces of primordial argon. Since argon is a gas at ambient temperature, it would leak out unless in tightly bound inclusions.

  6. #6
    Join Date
    Jun 2007
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    Quote Originally Posted by DaveC426913 View Post
    Yes. Rocks not from Earth have a different composition of elements and isotopes.
    some do but more common are molecules that donot form in an oxidizer environment like ours

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