NASA's Picture of the Day brings to light the stunning beauty of the cosmos, featuring the Iris Nebula, also known as NGC 7023, located 1,300 light-years away in the constellation Cepheus. This ...
Because the debris fields of exploded stars, known as supernova remnants, are very hot, energetic, and glow brightly in X-ray light, NASA’s Chandra X-ray Observatory has proven to be a valuable tool ...
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