From Star Wars: Episode II - Attack of the Clones
[Yoda is training children to be Jedi at the Jedi Temple. Obi-Wan comes in and explains he's looking for a planet
] Mmm. Lost a planet, Master Obi-Wan has. How embarrassing. How embarrassing. Find it, we will try.
[Pointing to a spot in the star hologram
] This is where it ought to be, but it isn't. Gravity is pulling all the stars in this area inward to this spot. There should be a star here, but there isn't.
Most interesting. Gravity's silhouette remains, but the star and all its planets have disappeared. How can this be?