Supernova remnant

Supernova remnant

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Caption: Supernova remnant. X-ray image of supernova remnant (SNR) G21.5-0.9. An SNR is the expanding shell of material ejected by a supernova, a huge explosion that occurs when a massive star runs out of nuclear fuel. It emits X-rays as it becomes heated during ejection. The source seen at lower right (green) is thought to be a foreground binary system containing two stars held in orbit around each other. The G21.5-0.9 data are a calibration source for X-ray observations made by the European Space Agency XMM-Newton satellite, launched in 1999.

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Keywords: astronomy, astrophysics, be star, cosmology, esa, european space agency, g21.5-0.9, satellite data, science, snr, spectral type b, star death, stellar, supernova remnant, x-ray binary, x-ray image, xmm-newton x-ray observatory, xray

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