Betelgeuse, one of the brightest and biggest stars in our night sky, has been acting strangely for years — suddenly dimming, then brightening again every six years. Now, astronomers believe they’ve ...

Add Yahoo as a preferred source to see more of our stories on Google. Artist's concept shows the red supergiant star Betelgeuse and an orbiting companion star. The companion, which is orbiting ...

A star system in our own galactic neighborhood is poised to put on a show so bright it could briefly rival the planets and even shine in daytime skies. Astronomers are watching for a sudden eruption ...