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The white star has a very high rotation speed and therefore casts part of its hull out into space. Most other stars of this kind like Tsih are much bigger blue stars.

Constellation: Ursa Major
Age: 300 million years
Distance: 84 light-years
Spectral class: Ae0
Visual magnitude: 2.44
Luminosity: 64 * Sun
Mass: 2.7 * Sun
Diameter: 3 * Sun

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The Big Dipper, a part of the constellation Ursa Major.
Phecda, one of the seven stars of the Dipper is on the right just slightly above the middle. The bright star at the top is Dubhe, the second bright star from left is the double Mizar and Alcor.
Photo: Akira Fuji, ESA

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