Mr. Hennigan writes about national security for Opinion. U.S. military personnel at Space Command, in Colorado Springs, have kept a close eye on Cosmos 2553 ever since it reached orbit. Bathed in the ...

Longtime NASA astronaut Don Pettit, who has ventured to space four times, returned to Earth on Saturday night from the International Space Station. Pettit, who turned 70 on Sunday, landed at 9:20 p.m.

The European Space Agency’s (ESA) Euclid space telescope has released its first test images. These pictures of sparkling stars and galaxies show that the new space telescope is beginning its daunting ...

The European Space Agency (ESA) is gearing up to launch its newest space telescope, Euclid, which is scheduled to blast off from Cape Canaveral in Florida on 1 July. Euclid is designed to help solve ...

Open Cosmos, a UK space tech startup, has raised $50 million in fresh funding. Founded in 2015, Open Cosmos had only raised $7 million previously. The company uses satellites to track and monitor ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Though most ...