November 4
Supernova Remnant 0509-67.5
Observed in 2010
This red bubble is made of gas that is being shocked by the expanding blast wave from a supernova explosion. Called SNR 0509-67.5, the bubble is 23 light-years across and is expanding at more than 11 million miles per hour.
Image credit: NASA, ESA, Hubble Space Telescope