| the universe is big, if the odds of one species to exist in the entirety of the universe are not too low, it is possible for 2 of them to evolve at near the same time. maybe not always, but i'm sure there was or will be a time before the universe dies that 2 civilizations happen to exist together.
Also, the planet need not be this particular distance, or need water. just because life here needs those things, doesn't mean there can't be something that feeds of sulfur or dry ice, or some wierd things. We not so recently discovered things living in the deepest trench at the bottom of the deepest ocean where any trace of sunlight is completely dried off. they live off volcanic crap from the center of the earth that spews out from the bottom of the trench.
We have wierd life here on earth, imagine what could have evolved under completely different conditions and all definitions of what life needs are thrown out the window. |