View Full Version : Afterglow of Supernova Remnant N132D

2005-Oct-04, 07:09 PM
SUMMARY: NASA's Hubble Space Telescope took this beautiful photograph of supernova remnant N132D, located in the Lesser Magellanic Cloud - a satellite galaxy to our Milky Way. By measuring the wispy cloud, astronomers estimate that the original star probably detonated about 3,000 years ago. A supernova-generated shockwave is traveling through space at a velocity of more than 2,000 kilometers per second (4 million mph), and colliding with surrounding material. This causes the material to heat up to millions of degrees so we can see it from here on Earth.

View full article (http://www.universetoday.com/am/publish/afterglow_n132d.html)
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2005-Oct-05, 03:44 AM
Just curious - the story says "a shockwave is travelling through space". If space is empty, then what is the shockwave travelling through, or is it actually travelling through the supernova material? If it passes this material, how does it continue travelling? I assume a "wave" is an area of compression within a certain material?