By Mike Deliman
A few billion years ago this planet formed, orbiting an otherwise
run-of-the-mill star. It was a wet world, covered with oceans, with a
protective atmosphere. Water dominated the surface. There may have
even been the beginnings of life there.
Space is brutal; a
significantly large asteroid slams into the planet. The impact
scatters debris into space, and tears much of the atmosphere away. It
also causes massive volcanism. The result is a planet with a thin
atmosphere and a nearly solid core, covered with water.