Pluto has always been a problem because it's less massive than the moon...[and] it's only about one 500th as massive as the Earth. So is it just a rock or is it a real planet?

151

We should know whether it's working in a few months.

142

It's not at all exotic. Every time you look at the water in a nuclear reactor, the bluish glow you see is radiation produced by charged particles moving faster than the speed of light in the water.

118