Yesterday was Carl Sagan's 75th birhday. If you don't know who he is, then you need to check him out here. When I was a kid, luckily we didn't have Bill Nye the Science Guy. We had the real thing in Sagan, a planetary astronomer and writer, who made science and the stars cool in his show Cosmos.
Join UA Planetary Scientist Kat Volk to search for Planet 9 in our outer Solar System and… More