Catastrophes (Evolution)

by David Turell , Sunday, November 23, 2008, 00:19 (5843 days ago) @ BBella

If we are already replacing our own organs from T-cells, why is it not possible that another species, far advance than our own, could use this planet as an experiment, or for whatever reason, to create beings with the DNA this planet had to offer, combined with their own DNA, to create a new species? - We use stem cells not T-cells for the research to create organ replacements. T-cells are those immune cells that HIV destroys to conquer the invaded human body. - As far as extraplanetary visits are concerned, the nearest star is four light-years away and the closest planets orbiting a star are very much further, and none so far are like Earth, and astronomier are looking at the closest stars to spot planets. Perhaps with the newer space telescope in development they will see further and find an earth-like planet, one that can support life. So there is the time-for-travel problem, and your proposed species would have to be very long-lived or know how to stop ageing. Another problem with the idea is SETI has never had an intelligable signal. There are two books available: Rare Earth and Privileged Planet, both of which think Earth is an exceedingly rare type of planet. They suggest we might be alone.