The object dubbed Earth's "second moon" is actually a quasi-satellite that's accompanied the planet since 1957 — not a true ...

Research into Jupiter’s moons shows Io and Europa did not evolve apart but formed with opposite compositions from the ...

Skygazers who look up at the moon tonight may be able to spot Saturn below it. Here's when and how to spot the conjunction.

Artemis 2 is at the launch pad, but several big tests must be performed before it launches as soon as Feb. 6.

This is what would happen if planets replaced the moon. Venus is almost the same size as earth. It would make the earth ...

As the four-person crew of Artemis II prepares to launch on a historic mission around the moon as soon as February, some experts are worried about the Orion spacecraft’s heat shield.

For a long time, scientists assumed that Earth's water was delivered by asteroids and comets billions of years ago. This ...

While you may expect cartoons to be filled with fluffy characters and silly storylines, these 12 cartoon characters have some ...

Sign up to receive CFR President Mike Froman’s analysis on the most important foreign policy story of the week, delivered to your inbox every Friday afternoon ...