Supernova remnant G1.9+0.3 in the constellation Sagittarius is the youngest known supernova remnant (SNR) in the Milky Way Galaxy. The remnant's young age was established by combining data from NASA's Chandra X-ray Observatory and the VLA radio observatory, and is believed to have exploded about 25,000 years ago, and the signal began reaching us 140 years ago (as of 2008). Prior to this discovery, the youngest-known Milky Way supernova remnant was Cassiopeia A, at about 330 years. The remnant has a radius of over 1.3 light years.
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“The remnant of Indians thereabout—all but exterminated in their recent and final war with regular white troops, a war waged by the Red Men for their native soil and natural rights—had been coerced into the occupancy of wilds not far beyond the Mississippi.”
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