In 2000, researchers thought they found the oldest fossil octopus, which lived over 300 million years ago. But it may just be a half-rotten nautilus.

As NASA’s Orion spacecraft slipped behind the farside of the moon, the astronauts captured the crescent of Earth setting over the moon’s horizon.

In The Creatures’ Guide to Caring, science journalist Elizabeth Preston looks to the animal kingdom to explore what it means to be a good parent.

Experts in echolocation use multiple clicks and echoes to sense objects, offering insight into how the brain builds perception.

The record-setting astronauts had a front-row view of the farside of the moon, an eclipse and perhaps a re-creation of the famous Earthrise.