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The life-bearing debris would have to arrive quite some time after formation of Earth, as it was molten. Surviving atmospheric entry is hard, surviving after landing in lava is impossible.

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I was going to expand on my comment about the difference between alien and non-alien being a difference only in time. It's all from the same stuff.

It makes a difference to our understanding of the conditions under which life can form.

If life-bearing debris exists, it would surely be floating around the galaxy forever.

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