
Originally Posted by
Osede
Actually, we don't need to look into all those 10^15 or whatever planets. Because there are still fundamental assumption and condition on the orbit of the planet, and the planet's distance to the star it orbits around. So, they will only study on those planets which fall under these condition. So far, if not mistake, besides Mars, they only found not more than 5 other planets that fulfill the earth like environment. But I think the NASA right now will still focus on looking for the sign of life in Mars, since it is the closest to earth.