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Supernova remnant Cassiopeia A as viewed by NuSTAR

Supernova remnant Cassiopeia A as viewed by NuSTAR

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NASA / JPL-Caltech / CXC / SAO

Supernova remnant Cassiopeia A as viewed by NuSTAR
Cassiopeia A is the remnant of a star that blew up in a supernova event whose light reached Earth about 350 years ago, when it could have appeared to observers as a star that suddenly brightened. The remnant is located 11,000 light-years away from Earth. In this image, NuSTAR data, which show high-energy X-rays from radioactive material, are colored blue. Lower-energy X-rays from non-radioactive material, imaged previously with NASA's Chandra X-ray Observatory, are shown in red, yellow and green. The red, yellow and green data were collected by Chandra at energies ranging from 1 to 7 kiloelectron volts (keV). The red color shows heated iron, and green represents heated silicon and magnesium. The yellow is what astronomers call continuum emission, and represents a range of X-ray energies. The titanium-44, shown in blue, was detected by NuSTAR at energies ranging between 68 and 78 keV.

Most NASA images are in the public domain. Reuse of this image is governed by NASA's image use policy.

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