Pluto is actually a dwarf planet, rather than a star. Many people think that the new images of Pluto taken from the NASA New Horizons spacecraft look similar to the Death Star from the Stars Wars movies. The similarity has started a joke that is spreading on the internet, since the two objects look alike (see figure down below).
Pluto

Pluto was originally a planet, but was demoted to a dwarf planet in 2006 because it is so small and very far away from the sun. In fact, it is so small that the diameter of Pluto is half of the width of the United States and it takes 248 earth years to complete one orbit around the sun!

Images of Pluto, the Death Star, and a Photoshopped image that overlays the death star on Pluto.