The other day I was watching a show on the science channel and they made the statement that maybe close to a billion years ago Mars was an exact copy of earth. Some even said that when Mars lost its protective layers that bits of mars drifted off and landed on earth to create life here.
I'm more interested in the concept of Mars being another earth.
I wonder if this is true what could have destroyed the atmosphere?
If so? Could it happen here?
I know that I've seen extensive research that all of human existence would be erased mostly by nature in 1000 years. Clearly that be the result of mars nearly a billion years since that destruction.
Thoughts?