Scientists have discovered what they believe to be the youngest known supernova, or exploding star, by tracking its size using NASA's Chandra X-ray Observatory and the National Radio Astronomy Observatory's Very Large Array.
When originally tracked in 1985 (left) using the Very Large Array, supernova remnant G1.9+0.3 was thought to be between 400 and 1,000 years old, but newer measurements by the Chandra X-ray Observatory (right) show surprising growth and indicate that it is a mere 140 years old.
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