NASAのインスタグラム(nasa) - 7月15日 02時48分

Glowing warmly against the dark backdrop of the universe, this irregular galaxy seen by our Hubble Space Telescope (@NASAHubble) contains bright pockets of star formation. Located approximately 70 million light-years away, it’s host to a particularly interesting exploded star, also known as a supernova.

In November 2008, 14-year-old Caroline Moore from New York discovered this supernova, which made her the youngest person at the time to have discovered one. Follow-up observations by professional astronomers showed that it was peculiarly interesting in many different ways.
First, its host galaxy rarely produces supernovae. It is also one of the faintest supernovae ever observed and after the explosion it expanded very slowly, suggesting that the explosion did not release copious amounts of energy as usually expected. Astronomers have now classified it as a subclass of a Type Ia supernova, which is the explosion of a white dwarf that hungrily accretes matter from a companion star. It may have may have been the result of a partially failed supernova, explaining why the explosion failed to decimate the whole star.

Credit: ESA/Hubble & NASA

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