Astronomy

Much of North America can witness a delightful astronomical event on the evening of December 7 as the moon blocks out Mars

The Ads/CFT duality conjecture suggests our universe is a hologram, enabling significant discoveries in the 25 years since it was first proposed

Elon Musk’s Starlink and other satellite sources of light pollution and orbital debris should face an environmental review, the U.S. Government Accountability Office finds

How, and whether, to keep atomic time in sync with Earth’s rotation is still up for debate

An investigation by agency historian finds no evidence explicitly linking former director James Webb with anti-LGBT+ actions

We are drawn to breathtaking images of the heavens, but there is beauty in the numbers those images hold

Growing swarms of spacecraft in orbit are outshining the stars, and scientists fear no one will do anything to stop it

SpaceX and the entrepreneur Jared Isaacman are pursuing a plan to rescue the iconic Hubble Space Telescope from a fiery plunge into Earth’s atmosphere

A new JWST image of a star surrounded by strange, rippling spirals reveals a hidden chapter in the story of how dust spreads across the cosmos

The death of a massive star far across the universe affected lightning on our planet and could teach us about the Milky Way

The fabled star catalog from the ancient Greek astronomer Hipparchus had been feared lost

Nearly two years after the collapse of its 305-meter radio telescope, the Arecibo Observatory’s fate has been decided. The iconic giant dish will not be rebuilt, but research and public outreach at the site may continue