Radio image of Cassiopeia A supernova remnant
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Radio image of Cassiopeia A supernova remnant

June 10, 2010
Radio image of Cassiopeia A supernova remnant. More about this Image Cassiopeia A is the remnant of a supernova explosion that occured over 300 years ago in our Galaxy, at a distance of about 11,000 light years from us. Its name is derived from the constellation in which it is seen: Cassiopeia, the Queen. A supernova is the explosion that occurs at the end of a massive star's life; and Cassiopeia A is the expanding shell of material that remains from such an explosion. This radio image of Cassiopeia A was created with the National Science Foundation's Very Large Array telescope in New Mexico. The image was made at three different frequencies: 1.4 GHz (L band), 5.0 GHz (C band) and 8.4 GHz (X band). Cassiopeia A is one of the brightest radio sources in the sky and has been a popular target of study for radio astronomers for decades. The material that was ejected from the supernova explosion can be seen in this image as bright filaments. Investigators involved in this research were L. Rudnick, T. Delaney, J. Keohane and B. Koralesky; image composite by T. Rector. (Date of Image: 1994)

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