19 Apr '13 12:50>
So we are now pinning down habitable planets:
http://news.msn.com/science-technology/nasa-twin-planets-perfectly-habitable-just-discovered
But what should we expect to find? In this case, the target planets have a 2.5billion year head start on our's and this is the comment made:
However, surely it is an error to assert that evolution proceeds as implied from less to more "advanced" forms of life.
For example, without the accidental impact of an asteroid on Earth, the dinosaurs need not have become extinct when they did and the path of our evolution would have been totally different. There is no reason to assume intelligent life would have evolved, rather than, say, a shift to a quite different but not terribly thoughful form of life. Grass evolved about 50 million years ago (from memory) and now turns up all around our planet; why would not some alternative form of plant life evolve on these new planets and so we discover they are covered in a fungus or weed or something totally tedious?
I just object to the assumption that evolution goes hand in hand with improvement or elevation or some such term.
http://news.msn.com/science-technology/nasa-twin-planets-perfectly-habitable-just-discovered
But what should we expect to find? In this case, the target planets have a 2.5billion year head start on our's and this is the comment made:
"If there's life at all on those planets, it must be very advanced" evolutionarily because the planets are so old, said Borucki.
However, surely it is an error to assert that evolution proceeds as implied from less to more "advanced" forms of life.
For example, without the accidental impact of an asteroid on Earth, the dinosaurs need not have become extinct when they did and the path of our evolution would have been totally different. There is no reason to assume intelligent life would have evolved, rather than, say, a shift to a quite different but not terribly thoughful form of life. Grass evolved about 50 million years ago (from memory) and now turns up all around our planet; why would not some alternative form of plant life evolve on these new planets and so we discover they are covered in a fungus or weed or something totally tedious?
I just object to the assumption that evolution goes hand in hand with improvement or elevation or some such term.