In a study from Cardiff Centre for Astrobiology in Cardiff, U.K., our solar system is heading toward a denser area of the galaxy which may mean higher chances for comet bombardment. Their studies indicate that these bombardments occur every 35 to 40 million years and may be responsible for the extinction of several forms of life over the eons. But they also indicate that these bombardments from space may have spread life throughout the galaxy. You can read more here.
So...what if our little planet has seeded life on other planets? And what if the same sort of phenomena has occurred on these other planets and spread their 'life creating substances' throughout the galaxy? I can see a wealth of SF stories rising from this. What about you?
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