Astronomy Picture of the Day
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July 18, 1995
Cygnus Loop Supernova Shockwave
Credit: NASA, HST, WFPC2, Jeff Hester
15,000 years ago a star in the constellation of Cygnus exploded. This picture
shows a portion of a shockwave from this
supernova explosion still expanding
past nearby stars. The collision of this gaseous shockwave with
a stationary gas cloud has heated the gas causing it to
glow in a spectacular array of colours, known as the Cygnus Loop.
This picture was taken with
the Wide Field and Planetary Camera 2 on board the
Hubble Space Telescope.
For more information see the NASA Hubble Space Telescope
Mountains of Mars
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