Panspermia

According to the BBC website, there was a TV program broadcast yesterday about the strange red 'rain' that has been reported in India, which at least one of the scientists involved feels is evidence for panspermia; where life from other planets takes a ride through space (inside a comet, for example) and colonises other worlds.

Now I don't know whether what they have in India is an alien cell (although my scepticism and cynicism suggest that they do not). However, in principle it is quite possible that some older planets in the universe, which might harbour alien life, might also accidentally seed other planets with their own replicating molecules. Just because life may have been introduced to the earth in this way, does not change what we know about evolution. Just that the actual cradle of life might be further away than we first thought.