An overview of some of Fermi's most surprising variable Galactic sources.

When Galactic sources like the Crab Nebula suddenly brighten, Fermi repoints to collect as many gamma rays as fast as it can.

The Crab Nebula continues to bring us surprises and it turns out that this previously presumed steady source actually slowly varies. Fermi-GBM uses the Earth Occultation Technique to monitor bright sources like the Crab.

Binary star systems are responsible for a lot of the Galactic fireworks Fermi observes. These systems have inspired animations and bakers alike.