NASA's Chandra X-ray Observatory detected a bright X-ray-emitting blob in Sagittarius C, a region near the center of the Milky Way. Astronomers identify it as a possible supernova remnant from the explosion of a massive star. The object lies near Sagittarius A*, the supermassive black hole at the galaxy's center, about 26,000 light-years from Earth. Researchers estimate the star exploded about 1,700 years ago and expelled material at roughly 2 million mph, or about 3.2 million km/h. If confir...

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