An anonymous reader writes "A 15-year, continuous observation of the red supergiant Betelgeuse has found the star, one of the largest known, is shrinking — but astronomers don't understand why.
"We don't know what is causing the shrinking of Betelgeuse. This is part of the surprise and puzzle," astrophysicist and Nobel laureate Charles Townes told Cosmos Online.
Betelgeuse is a red supergiant red star about 20 times as massive as the Sun. It sits in the western shoulder of the constellation Orion, and is one of the brightest stars in the sky." Link to Original Source
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