Credit: J.J. Hester (Arizona State University), and NASA. Co-investigators: P.A. Scowen (Arizona State University), Ed Groth (Princeton University), Tod Lauer (NOAO), and the WFPC Instrument Definition Team.
The Cygnus Loop
Credit: J. Hester (ASU), NASA
Explanation: The shockwave from a 20,000 year-old supernova in the constellation of Cygnus supernova explosion is still expanding into interstellar space. The collision of this fast moving wall of gas with a stationary cloud has heated it causing it to glow in visible as well as high energy radiation, producing the nebula known as the Cygnus Loop (NGC 6960/95). The nebula is located about 2500 light-years away.
The colors used here indicate emission from different kinds of atoms excited by the shock: oxygen-blue, sulfur-red, and hydrogen-green. This picture was taken with the Wide Field and Planetary Camera 2 on board the Hubble Space Telescope.
Info Source; NASA
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