Sun news April 25: Activity’s high, aurora on the way

April 25, 2024, sun news. Sun activity is high. Flare and after-flare continue. CMEs and so auroras are on the way tonight or tomorrow.

Cor Caroli, named for the heart of a king

Cor Caroli is a binary star and the brightest star in the northern constellation Canes Venatici, the Hunting Dogs. Its name means Heart of Charles.

Beta Centauri is one of the Southern Pointer Stars

Beta Centauri isn’t as famous as Alpha Centauri, but together, these brilliant Southern Hemisphere stars have inspired legends and guided mariners.

Betelgeuse is dimming again. When will it explode?

Will Betelgeuse have another period of noticeable dimming in 2024? Betelgeuse will explode as a supernova someday. When it does, it'll be visible in daylight.

Lonely Alphard is the brightest star in Hydra

Alphard is the "heart" and brightest star in the constellation Hydra the Water Snake, and it represents a welcome sign of spring for the Northern Hemisphere.

Meet Pollux: The brighter twin star of Gemini

Pollux, the brightest star in the constellation Gemini, blazes in a golden light next to its bluish-white heavenly twin, Castor.

Castor is 6 stars in one

The bright blue-white star Castor, in the constellation Gemini, appears to our eyes as a single star. But it’s really a family of 6 stars.

Can you see Canopus, the 2nd-brightest star?

Here's how to spot Canopus, the 2nd-brightest star in the sky as seen from Earth, on February evenings. It’s located far south on the sky’s dome.

Mizar and Alcor in the bend of the Big Dipper

Mizar and Alcor are a famous pair of stars located at the bend of the handle of the Big Dipper. Can you see both without using binoculars?

See Sirius, the brightest star in the night sky

Spot Sirius in Canis Major the Greater Dog - the brightest star as seen from Earth. Learn the science and mythology of Sirius the Dog Star.

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