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| 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. Picture Stats: Views: 438 Filesize: 383.45kB Height: 828 Width: 1350 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=18409 |