Julius Montgomery, Who Broke a Space-Age Race Barrier, Dies at 90

In the Jim Crow South, he was the first black professional to be hired at Cape…

Watch Mars Disappear Behind the Moon in the Early Morning Sky

In what is known as an occultation, Mars will briefly be blocked by the moon on…

Watch the Moon and Mars Meet Up in the Early Morning Sky

In what is known as an occultation, Mars will briefly disappear behind the moon on Tuesday…

Just a Few Billion Years Left to Go

In “Until the End of Time,” the best-selling physicist Brian Greene explains how the universe will…

From Dubai to Mars, With Stops in Colorado and Japan

The United Arab Emirates used a novel approach to build the Hope spacecraft, which launches for…

The Further Adventures of Betelgeuse, the Fainting Star

The red supergiant is no closer to exploding, it seems. It also no longer appears round. …

We’ve Never Seen the Sun’s Top or Bottom. Solar Orbiter Will Change That.

The NASA-European Space Agency spacecraft, which launched Sunday, will spend the next decade closely observing the…

NASA-E.S.A. Solar Orbiter Launch: How to Watch

The spacecraft will make close observations of the sun, including first-ever looks at its north and…

Boeing Spacecraft for Astronauts Could Have Been Lost to Software Flaw

The problem was fixed while the Starliner capsule was in orbit during an uncrewed December test…

OneWeb’s Launch of 34 Satellites Adds to Astronomers’ Fears for Night Skies

Like SpaceX, the company aims to build a constellation of internet satellites, but its orbiters could…