Many of us grew up being told that Pluto is the ninth planet in our solar system. Now, though, that’s all being questioned.
Some NASA scientists now believe Pluto might actually be a giant comet -- as in, a collection of a billion comets all put together and flying around the sun.
Obviously, humans are probably not visiting Pluto in this lifetime, but it would be nice if the scientists could figure out what’s going on out there so they don’t keep changing their minds on this stuff. (Space)