cyberdad wrote:
Jono wrote:
Well, Earth is a bit bigger than Mars for one. This means that the Earth's core will take longer to cool down and will continue to generate an electromagnetic field that keeps the atmosphere from being stripped by the solar wind, like what happened to Mars.
Isn't Mars in the "Goldilocks zone" ?
It might be. But thats the very point. Even if it is in the Goldilocks zone its lack of protection by a magnetic field means it gets sterilized by a solar wind. So life might be able to form there (and indeed Mars did have liquid water in the past) but it gets zapped by the solar winds.
Also Earth is just as pockmarked by meteors as the moon. Its just less obvious because Earth is more geologically active, and has vegetation and so forth. So its able to cover up its blemishes better than can the moon.