Irene Klotz

NASA, Europe, India, China, the United Arab Emirates, and SpaceX are all planning Mars missions to take advantage of a launch opportunity in three years.

Evidence of iron-eating microbes that existed earlier in Earth's infancy than previously known offers clues about where and what to look for in seeking signs of life elsewhere in space.

A space-based gravitational wave observatory may be launched ahead of schedule, enabling scientists to detect ripples in space, a phenomenon first envisioned by Albert Einstein 100 years ago.

A safety oversight panel expressed concern Thursday (Feb. 23) about an idea, currently being studied by NASA, to put astronauts aboard the first flight of the heavy-lift Space Launch System rocket.

After five years, a California company called Planet has more than 100 satellites in orbit, allowing it to begin selling and providing images of the entire Earth every day.

Just as NASA scientists were preparing to use Curiosity's "wet chemistry" experiment for the first time, the rover's drill broke, throwing a key test for organics on the Red Planet into doubt.

The US military’s X-37B robotic space plane, now nearing two years in orbit, is conducting “a regularly scheduled exercise this week,” not preparing for landing, the Air Force said today (Feb. 14).

Orbital ATK claims the government-backed program rivals its own planned satellite life-extension business, violating provisions of the 2010 U.S. National Space Policy.

By using a quirk of Einstein's general relativity and applying a new technique to remove obscuring light, astronomers have found an ancient population of the universe's first galaxies.

Jeff Bezos' private space company is eyeing 2020 to begin flights of the orbital New Glenn rocket.

Comet 45P/Honda-Mrkos-Pajdusakova, returning to the inner solar system after more than five years, will be visible this week with binoculars or a small telescope.

NASA has issued solicitation for science projects using the long-awaited and incredibly powerful successor to Hubble, which is scheduled to launch next year.

This month, NASA's asteroid-sampling Osiris-Rex mission will search for possible Trojan asteroids that could be traveling along with Earth around the sun.

Elon Musk's rocket company has bumped a commercial satellite mission until after a scheduled mid-February cargo run to the International Space Station.

The Japanese PROCYON spacecraft may have gotten stuck in orbit after launch, but it's been able to do some impressive observations of 67P/Churyumov-Gerasimenko from afar.

The discovery of these bite-sized galaxy clusters provides a key piece of evidence for how galaxies evolve — and how dark matter might be in the middle of it all.

A United Launch Alliance Atlas 5 rocket blasted off from Florida today (Jan. 20) to put a missile-detection and early warning satellite into orbit for the U.S. military.

SpaceX plans to break in its new launch pad at NASA’s Kennedy Space Center (KSC) just after midnight on Jan. 30 with a Falcon 9 rocket ride for EchoStar Corp.

Before Elon Musk's private spaceflight company can use its rockets to transport NASA astronauts into space in 2018, it has a lot of work to do.

The generation of NASA astronauts who traveled beyond Earth orbit is now in their 80s.

Grounded since September, Elon Musk's private spaceflight company is aiming to launch 10 communications satellites into orbit from California on Saturday morning.