Find the red shoulder of Orion
Betelgeuse marks one of Orion’s shoulders. Its orange-red tint is easier to notice when compared with blue-white Rigel, which lies on the opposite side of the familiar constellation. In the Northern Hemisphere, Orion is especially prominent on winter evenings.
What makes it a supergiant?
Betelgeuse is a massive, evolved star whose outer layers have expanded and cooled. Its enormous size gives astronomers a rare opportunity to study details of a star’s surface. Estimates of its distance and size have changed as measurements improve, so figures should be treated as estimates.
The Great Dimming
In late 2019 and early 2020 Betelgeuse became noticeably fainter before recovering. Researchers used observations including data from the Hubble Space Telescope to investigate. One explanation involves material ejected by the star cooling into dust that obscured part of its light. Scientific models continue to be refined.
Will it explode soon?
Stars of this kind eventually end their lives in dramatic events, but astronomers cannot predict the date of Betelgeuse’s eventual explosion. A change in brightness is not by itself a reliable countdown. For now, it remains a rewarding star to observe and compare over time.