White Dwarfs
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Transcript: In 1844 German astronomer Friedrich Bessel studied the motions of Sirius, the brightest star in the sky, and found that it was being tugged by an invisible companion. The companion was eventually detected in 1915 in the glare of Sirius, and it was far too dim to have properties that placed it on the main sequence. It was hotter and much less luminous than the Sun. In terms of its properties, its surface must not be much larger than the surface area of the Earth. This entirely new type of star was called a white dwarf.
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