Astronomer Edward Guinan of Villanova University has given Betelgeuse an ultimatum of sorts. Guinan, who has closely tracked the star's brightness for the past 25 years, predicts that the supergiant will reach minimum brightness on February 21st, plus or minus a week. In fact, Betelgeuse-watchers have noticed that the rate of dimming has slowed in […]
By 8 or 9 p.m. the Big Dipper stands on its handle in the northeast. In the northwest, Cassiopeia stands on end at about the same height. The post This Week’s Sky at a Glance, February 14 – 22 appeared first on Sky & Telescope.
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