heasarc.gsfc.nasa.gov

x6a8g TIL supernovae become so bright that they may briefly outshine their entire home galaxy
Ly80 TIL: The common spiral depiction of the Milky Way Galaxy used in media is actually another galaxy:Messier 74. Because we dwell within the Milky Way Galaxy, it is impossible for us to take a picture of its spiral structure from the outside.
MR67 TIL that dropping a marshmallow onto a neutron star would create an explosion bigger than 1000 hydrogen bombs.