Originally posted by: her209
What are the chances of other planets having the same temperature ranges as ours given the size of the planet, the size of sun, the composition of the atmosphere?
Chances are extremely good.
It's hard to grasp just how big the universe is... but here's something to think about:
There are 200-400 billion starts in our galaxy alone, and there are about 10 billion galaxies in the known universe. There are an estimated 2,000 Billion Billion star in the known universe (write that out, that's 2,000,000,000,000,000,000,000 stars)
Considering that even here on Earth, life is found floating in the air, on the ground, deep within the Earth, and even under tons of pressure on the ocean floor getting energy from thermal vents, it's pretty evident that life is very hardy, and can live almost anywhere.
I don't think that life is unique to the Earth. There's probably life all over the universe, it's just too big for us to explore.