Hypersonic Missiles Are Unstoppable. And They’re Starting a New Global Arms Race.

The new weapons — which could travel at more than 15 times the speed of sound…

Why Did the Moon Landing Matter? A Slew of New Books Offer Answers

Jill Lepore explores the many new accounts of the Apollo 11 mission on its 50th anniversary,…

One Small Tweet for Trump, One Giant Question for NASA’s Moon Plans

A tweet by the president clashed with earlier statements, including his own, about a renewed focus…

Want to Buy a Ticket to the Space Station? Soon, You Can.

NASA plans to open the International Space Station to commercial business, including tourism. But the tickets…

After SpaceX Launch, a Fear of Satellites That Outnumber All Visible Stars

Images of the Starlink constellation in orbit have rattled astronomers around the world. Click…

NASA Hires 3 Companies for Moon Deliveries

The landers would be the first American spacecraft to touch down on the moon since the…

Manhattanhenge 2019: When and Where to Watch

This week could be your chance to take “the best sunset picture of the year” in…

‘Wow, What Is That?’ Navy Pilots Report Unexplained Flying Objects

No one at the Pentagon is saying that the objects are extraterrestrial, but the Navy has…

Murray Gell-Mann, Who Peered at Particles and Saw the Universe, Dies at 89

A Nobel winner, he found hidden patterns in the subatomic matter that forms the universe, evoking…

SpaceX’s Third Launch Attempt of Starlink Internet Satellites Set for Tonight

The payload of 60 satellites could be an important new line of business for the private…