NASA

The head of the U.S Senate subcommittee overseeing NASA says the agency's spending on space missions has fallen in recent years.

The saline ocean under Jupiter's moon Ganymede might hold more water than there is on all of Earth.

Forced to ration its leftover plutonium-238 stockpile, NASA announced that it would not be using nuclear fuel for the next Discovery mission.

US 708 is hurtling through the Milky Way at about 745 miles per second -- making it the fastest moving object in the galaxy.

Nearly 4.3 billion years ago -- 200 million years after the formation of Earth -- Mars had more water than the Arctic Ocean currently holds.

In a surprise move, Jack Ma’s company said Wednesday that it plans to open a commercial data center in the heart of Silicon Valley.

The rover was sifting drilled rock when it alerted its earthling handlers to an internal mechanical error.

So-called Trekkers such as U.S. President Barack Obama have paid tribute to Leonard Nimoy, aka Mr. Spock on "Star Trek," since his death Friday.

The latest self-portrait of the rover is a collection of pictures taken by the vehicle's robotic arm on the Red Planet.

Using data gathered by NASA’s CALIPSO satellite, scientists found that every year, 27 million tons of Saharan dust reaches the Amazon.

Debris from a December Chinese satellite launch was likely the culprit of a fireball seen across the Western U.S. sky.

Extraterrestrial life may not consist of grey creatures with large black eyes, but NASA thinks there may be different types of living organisms on Europa.

Have you ever wondered what life would be like on Saturn's moon, Titan? NASA has, and the agency wants to send a space sub there.

We are all familiar with the front side of the moon, but a new video shows the side that we never see.

ESA's Planck space observatory data suggests that the "Dark Ages" of the universe lasted 140 million years longer than previously thought.

The New Horizons space probe, launched in 2006, will make a close flyby of Pluto in July.

Contracts with SpaceX and Boeing will help the U.S. reduce its reliance on Russia to get to the International Space Station.

The star, named Kepler-444, is 11.2 billion years old, making it almost as old as the Milky Way.

NASA's probe Dawn has dwarf planet Ceres in it sight.

U.S. crew members were told to evacuate their section of the International Space Station following an ammonia leak.

Cruz hasn’t exactly been the space agency's biggest advocate.