スミソニアン博物館のインスタグラム(smithsonian) - 8月28日 05時42分

Twenty years ago this week, @nasachandraxray released the "First Light" image of the Cassiopeia A supernova remnant 11,000 light-years from Earth.
Cas A (its nickname) is the glowing debris field left behind after a massive star exploded. When the star ran out of fuel, it collapsed onto itself and blew up as a supernova.
Shortly after the Chandra telescope was launched aboard the Space Shuttle Columbia in 1999, astronomers directed the observatory to point toward Cas A. The image revealed, for the first time, a dense object called a neutron star that the supernova left behind. Chandra has returned to Cas A over the last 20 years to continue to learn more about the physics of the explosion and the change in the cosmic object. #Chandra20
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