The Hubble Space Telescope captured this phantasmic red gas cloud named SNR 0519. Astronomers say it is the remnant of a white dwarf star some 150,000 light-years away that exploded as a supernova.
Williams College astronomer Steven Souza told Huffington Post that “light from the supernova explosion itself would have reached us between 400 and 800 years ago, but there is no indication that anyone actually observed it then. The explosion actually happened about 150,000 years ago, but due to the finite speed of light we are only now seeing its ~600-year-old remnant.”
Image courtesy Claude Cornen/ESA/NASA.