Astronomy

The European Space Agency's ambitious Euclid space telescope is on its way to decoding the secrets of dark matter and dark energy

An artist, a programmer and a scientist have created a simulation of extraterrestrial communication to test Earthlings’ ability to understand it

The “magnitude scale” for measuring stellar brightness also reveals the limits of naked-eye stargazing

Experts weigh in on the most shocking, paradigm-shifting and delightful findings in the history of physics

Comet 12P/Pons-Brooks, headed for its closest encounter with the sun next year, has started to heat up, leading to a cinematic outburst of icy volcanism

Astrophysicist Aomawa Shields recounts her alternative career path in a new memoir about life, space and motherhood

This week—and any time there’s a new crescent moon—the lunar night is a little less dark, thanks to the bright reflected light of Earth

Get to know the stellar trio behind one of the most iconic sights in summer’s night sky

Astronomers found two colliding galaxies dating back to less than 500 million years after the big bang

The sun is quickly approaching a major peak in solar activity. Experts warn it could potentially begin by the end of 2023, years before initial predictions suggested

Our planet’s not-quite-circular orbit means that on July 6 we’ll be about 2.5 million kilometers farther from the sun than average—but we won’t feel any colder

The cold and mysterious Oort cloud at the edge of our solar system may be hiding a rogue planet