APOD 4.5

http://apod.nasa.gov/apod/ap110523.html

The crab nebula flared on April 11, 2011, and was captured by the Fermi Gamma Ray telescope (it only flares in gamma rays). This flare was five times the usual gamma ray intensity of the nebula. Suspicions are that there is a compact neutron star at the center of the galaxy rotating very fast and causing disparities in intensity and period. This is due to the variable magnetic field created in which the electrons flow differently around.