Once I read some scientists wanted to know which degree of the earth axis would be optimum for a devellopment of live like we know it. If I remember right, our earth axis has a degree of 21.5°, and the result was a degree between 20° and 22°! Har har har! For sure it had to be, because life as we know it is optimized perfectly for the conditions of our planet, which means a very precise distance to the sun, a moon causing tidal waves, a magnetic field to keep of cosmic radiation, and so on...

But think about the extreme conditions microbes survive on this our own planet, while most species live only in certain mid range areas of the biosphere. Imagine a planet where are nearly, but not exactly similar conditions like on earth. Imagine a planet where there is an atmosphere, shelter against overmwhelming radiation from space and sun, enough chemical activity to rise the probability of some kind of self producing protein evolving... But the sun is six times bigger than ours and the planet is part of a sub-system in a triple star system. why not??? Who looks for another earth will have to find another one. The fact mars is nearly, but not exactly earthlike, and it's obviously sterile, doesn't count. there doesn't have to evolve life on every single planet that might be able to.