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SlideshowReport

Interstellar Reddening

Description
A Supernova Remnant
(a) X-ray image of the Cygnus Loop, the remnant of a supernova that occurred nearly 20,000 years ago. The expanding spherical shell of
gas now has a diameter of about 120 ly. The entire Cygnus Loop has an angular diameter in our sky 6 times wider than the Moon.
(b) This visible-light Hubble Space Telescope image of part of the Cygnus Loop shows emission from different atoms false-color-coded
with blue from oxygen, red from sulfur, and green from hydrogen.
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