On long space voyages, food variety will be key.
The biggest, most expensive science experiment in the world might be losing all its dark matter. But physicists are looking on the bright side.
The kilogram isn't a thing anymore. Instead, it's an abstract idea about light and energy and fundamental universal constants.
NASA is inviting people around the world to submit their names for inclusion on microchips that will fly aboard the life-hunting Mars 2020 rover, which is scheduled to launch next summer.
Earlier this month, engineers put the Mars 2020 rover's fully assembled spacecraft through some tests at the Space Simulator Facility at NASA's Jet Propulsion Laboratory in Pasadena, California.
Here's a guide to SpaceX's launch schedule, other rocket missions, astronomical events of the next year, as well as milestones for spacecraft already in travel.
An Illinois police officer on a routine trip earlier this month saw a fireball suddenly light up the sky in front of the car's dashboard camera.
Here are the some of the best science fiction books Space.com's writers and editors have read and loved.