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they are warming up,thats why if a meteor is coming near earth or something bigger,you see a trail,if you use high tech telescopes you can see trails of water,that is melting from the meteors core.Meteors and asteroids that have water and carbon,from that with organic building materials life started to thrive.
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That's not the same as being warm. Meteors approaching the sun will be warmer than when they're further away, yes, but that doesn't allow them to be warm all the time, even when they're a long distance away.
Also, you're confusing meteors with comets. Comets have large amounts of ice, whereas meteors are mostly rock. A comet's tail is not caused by the ice melting away, it is because the solar wind blows past the comet and strips ice crystals from the surface.
Scrabtrapman (and others); you're confusing the situation. Meteors don't need to be warm and any hypothetical lifeforms don't need to be pursuing active, motive, life. They could be in deep freeze until they crash land in to a warmer environment.