As fans of the classic "Star Wars" movies know, the Death Star is the ultimate planet-killing machine. When an early prototype of this machine is unleashed in Star Wars IV (the original 1977 movie) and destroys Alderaan, it sparked a famous line by Obi-Wan Kenobi about it disturbing the Force: "I felt a great disturbance in the Force, as if millions of voices suddenly cried out in terror, and were suddenly silenced. I fear something terrible has happened."
ANALYSIS: Was 'Star Wars' Right? Can We Walk On Most Exoplanets?
There is a Death Star in our own solar system but relax, it's not a threat to Earth. It's actually a moon of Saturn called Mimas. The big crater you see in this image is Herschel Crater, which was carved out by a big asteroid that could have threatened the very integrity of the moon. Another tidbit about Mimas:
it's frozen for reasons that scientists can't quite understand
. After all, fellow ice moon Enceladus is spurting geysers very visible with the Cassini spacecraft.
As it's "Star Wars Day"
, NASA picked out a few more worlds
with a decidedly sci-fi vibe
. Here are some of our favorites.