I am reading Chris Impey's book "The Living Cosmos". He writes that for a rock to go from star to star it only takes a few hundred thousand years, as opposed to the millions of years it takes the same rock to go from Mars to the Earth. The difference is the big number of collisions the second trip has, compared to almost no collisions in the interstellar space.
Maybe our life came from another star, or maybe we can send life to another star. One just needs to plan.
Professor Jay Melosh researched this proposal and called it Transpermia. Now it is known as Panspermia.
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