The First Star Whose Diameter Was Measured

On this day in 1920 the star Betelgeuse became the first to have its angular diameter measured. Betelgeuse is the second brightest star in the constellation Orion and is nearly 1000 times larger than our Sun. It is one of the largest and brightest known stars, emitting more light than 100,000 Suns. Because of its extreme size the star will soon collapse in a supernova, even though it is young for a star at only a few million years old.
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