This image shows Simeis 147, more popularly known as the Spaghetti Nebula. It is a remnant of a supernova estimated to have taken place 40,000 years ago and measures roughly 150 light-years across at an estimated distance of 3000 light-years from Earth. This translates to an angular size of almost three degrees, or six full moons, on the sky. The composite image includes data taken using filters, which enhance the reddish emission from ionised hydrogen atoms in the shock waves. The remnant was found to also emit photons with energies in the GeV range by the Fermi-LAT satellite. These gamma rays, thought to originate from neutral pion decay, are not associated with the neutron star also thought to populate the remnant, but rather with the red spaghetti-like lines of the remnant.