Space
Dark energy surprise suggested by super set of supernovae
A new analysis of supernovae observations hints that dark energy may change strength over time. It could mean we need to recalculate the universe's fate.
Space
Meet Apep, a pair of dying stars in a swirling nebula
Webb has captured an image of Apep, which includes the swirling nebula around 2 dying stars. A scientist explains what we know about it now.
Space

Top 10 cool things about stars that you probably didn’t know

Here's a collection of 10 cool things about stars that you probably didn't know. Big stars, green stars, black holes, stars by the millions, and more!
Astronomy Essentials
Tonight

Visible planets and night sky guide for July and August

Visible planets and night sky guide. Watch for the Delta Aquariid and Perseid meteors now, while the moon is still only a crescent in the sky.
Earth
Sun

Sun news: Eruptions in the west

Sun news July 30, 2025. In the past day, we've seen lots of flares, but only C class. The sun's western edge looks fiery!
Earth

Hurricane Iona now a major hurricane, south of Hawaii

Hurricane Iona and Tropical Storm Keli are the first 2 tropical cyclones of the central Pacific hurricane season. Read more about them here.
Space

This baby exoplanet is shrinking toward a sad destiny

NASA's Chandra X-ray Observatory has found a baby exoplanet that is slowly losing its atmosphere and shrinking as it is pummeled by radiation from its star.
Constellations
Tonight

Corona Borealis, the Northern Crown is overhead now

Corona Borealis, aka the Northern Crown, looks like the letter C. A dark sky is best for seeing this faint semicircle of stars. It's between Arcturus and Vega.
Brightest Stars

Eltanin and Rastaban, the Dragon’s eyes

These 2 famous stars shine down from the northern sky. Eltanin and Rastaban represent the fiery eyes of the constellation Draco the Dragon.
Earth

Did arachnids originate in the sea? A new study suggests so

We think of spiders, scorpions and other arachnids as land creatures. But according to a new study, they might have originated in the sea.