The Cassiopeia A supernova remnant, resembling a giant blue donut, has been observed for over 2 million seconds since Chandras mission began in 1999. The image combines X-rays from Chandra (blue) and… [read more]
The Cassiopeia A supernova remnant, resembling a giant blue donut, has been observed for over 2 million seconds since Chandras mission began in 1999. The image combines X-rays from Chandra (blue) and… [read more]
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