Here's the maths....
Drake equation - Wikipedia, the free encyclopedia
A planet of our size with the right angle of axis and the right speed of rotation with a moon of the same size and distance and the same distance from a star of similar size and also on the rim of a galaxy like our own might seem rare.
However there are hundreds of billions of stars in our galaxy and hundreds of billions of galaxies in the universe.
The chance of there being billions of planets fitting the conditions that exist on our planet are therefore quite high.
It would be stranger if there wasn't life our there than if there was.
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