Hanneke Weitering

An Ariane 5 rocket will launch two new satellites for Japan and South Korea from French Guiana today (Feb. 18) at 5:18 p.m. EST (2218 GMT), and you can watch it live online.

NASA's newest Mars rover has just left the nest.

The first flight of NASA's Space Launch System and Orion crew capsule was originally scheduled to launch this year, but the mission is now expected to slip to 2021.

Starliner's crew module could have "bumped" into its service module after separation if Boeing hadn't caught the error.

Three Expedition 61 crewmembers will leave the International Space Station and return to Earth Thursday (Feb. 6), and you can watch their journey home live online.

Northrop Grumman's Cygnus NG-12 cargo spacecraft departed the International Space Station today (Jan. 31) and will spend the next month completing a secondary mission before meeting its fiery demise.

A prototype of SpaceX's Starship Mars-colonization spacecraft blew its lid in a crucial pressure test late Tuesday night (Jan. 28).

Tonight (Jan. 28), you can catch the crescent moon make a close approach to Venus in the evening sky.

A new memorial for Félicette, the first and only cat to go to space, has arrived at its permanent home at the International Space University in Strasbourg, France.

The waning crescent moon will form a triangle with the Red Planet and the bright star Antares in the morning sky on Monday (Jan. 20), and you can catch the trio in the morning sky before dawn.

In its first launch of the year, Arianespace successfully used an Ariane 5 rocket to launch two new communications satellites into orbit for Eutelsat and India. See photos of the mission here!

The European launch provider Arianespace will use an Ariane 5 rocket to launch two new communications satellites into orbit today (Jan. 16), and you can watch it live online.

Two NASA astronauts are taking a spacewalk outside the International Space Station today (Jan. 15), and you can watch all the action live online.

A SpaceX Dragon cargo resupply spacecraft will undock from the International Space Station today (Jan. 5) to begin a 5-hour journey back to Earth, and you can watch its departure live online.

The year 2019 was an amazing one for space photography. From rocket launches to the northern lights, here's 100 cosmic views dazzled us as the year made its annual trip around the sun.

Boeing will make history this week when it sends its CST-100 Starliner spacecraft to the International Space Station for the first time, and you can keep up with the weeklong mission live online.

Astronomers gazing into the heart of the Milky Way have discovered new clues about our galaxy's dramatic past.

NASA just appointed a new leader for its human spaceflight program, and he’s dead set on making sure the agency puts astronauts on the moon in 2024.

An Ariane 5 rocket will launch two new communications satellites from French Guiana today (Nov. 26), and you can watch it live online.

These astronaut selfies are literally out of this world!

Two astronauts are gearing up for what may be the most challenging spacewalks in history.

The tiny planet Mercury scooted across the sun's face today (Nov. 11) for the last time until 2032, and skywatchers around the world had the chance to witness the rare celestial event.

When Mercury passes in front of the sun on Monday, you'll need the right equipment to see it safely. But if you don't have that kind of astronomy gear handy, you can also watch it live online.

The Mercury transit on Nov. 11 will be accessible to amateur astronomers, as long as they have the right equipment to view it safely.

See photos of Boeing's Starliner pad abort test mission on Nov. 4 in this gallery.