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Old November 6 2013, 06:45 PM   #10
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Location: Huntsville, AL, USA
Re: 1 in 5 stars have earth-like planets around them!

Metryq wrote: View Post
As for the "habitable zone" argument, the Earth and Moon are in the same zone, and several theories describe the Moon fissioning off from Earth. So why doesn't it have at least one sixth the atmosphere of Earth and some of Earth's other attributes?
A lot of that has to do with the the moon only getting some of the lighter materials, and not stuff like the iron core. I don't have a lot of time right now (in a meeting at work! ), so I'll let others expand on that.

Metryq wrote: View Post
If life is ever found on Titan, for example, that would scrap the "habitable zone" argument.
"Habitable zone" only takes into account the star. It doesn't take into account other factors like the planet or moon having internal heat due to gravitational stresses.
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