Betelgeuse Is Shrinking
by AMNH on
The famous star in the Orion constellation has reduced in size 15 percent over the past 15 years, according to observations from the University of California, Berkeley. Why a red supergiant star would shrink is still unknown.
Scientists speculate that the measurements may be affected by giant convection cells on the star's surface that are like convection granules on the sun, but so large that they bulge out of the surface. However, the star's brightness has not changed significantly, and the star appears to be symmetrical.
In 1921, Betelgeuse was the first star to have its diameter measured outside the solar system.