Nevada was once home to Prometheus, an ancient bristlecone pine that was also the oldest living organism on the planet. Then ...

What would it take to make a cobb salad on Mars? How would you grow the lettuce, or raise the chickens? NASA launched a challenge Tuesday that aims to answer questions like these.

Planets usually stay close to stars, moving in neat paths for billions of years. Yet some worlds break free and travel alone through the Milky Way. Astronomers call such worlds free-floating planets.

Colleen Keating, chief executive of Planet Fitness, wants them to do it in a “judgment-free zone.” By Jordyn Holman Jordyn Holman tries to maintain a weekly workout routine of strength training, ...

Most of the exoplanets we’ve discovered have been in relatively tight orbits around their host stars, allowing us to track them as they repeatedly loop around them. But we’ve also discovered a handful ...