When you vaporize rock, there is very little hydrogen -- whereas 50 percent of the atoms in a rock are oxygen.

Chess is a game with simple rules and pieces, a small sixty-four-space board, but there are more possible chess games than there are atoms in the universe.

You wait for a gem in an endless sea of blah.

We think comets make up a huge amount of stuff out in the solar system. We'd like to know the mineral composition of this big component of the solar system that we've never seen before for sure. Various particles have been measured that have been inferred to be from comets, but nobody's sure. This would finally provide some ground truth.

The [KT] layer is thought to be the fallout from the fireball.

The [KT] layer is thought to be the fallout from the fireball,