Space.com

The world's largest vacuum chamber is ready for NASA's James Webb Space Telescope.

On April 5th, 1973 the Pioneer 11 spacecraft was launched from Cape Canaveral on what was originally a back up mission for the Pioneer 10. Eventually NASA made an ambitious mid-mission change to Pioneer 11's trajectory, sending it to Saturn & beyond.

You can see all but a few of the 110 Messier objects in a single night this weekend.

Sunspot 1748 had just begun its rotation to the Earthside of the Sun on April 5th and already has erupted twice. The first was a C2-class flare and a stronger M2-class flare occurred about 10 hours later.

NASA halts outreach to save money, but what will be the long-term effects?

She was a pioneering rocket scientist who invented a more efficient thruster to keep satellites in orbit.

Chris Hadfield used his Twitter account to craft an elaborate April Fools' Day prank.

A new campaign from a private organization could give NASA a public boost.

Jupiter & Saturn, galaxies from the Leo constellation, the Lyrid Meteor Shower and a partial lunar eclipse highlights the night sky in April.

The Swiss Space Systems SOAR space plane will launch from the back of an Airbus A300 jetliner.

See photos of Swiss Space System's unmanned satellite-launching rocket plane SOAR.

Russia has a five-step plan to launch new ambitious robotic moon missions through 2020.

Two astronauts aboard the International Space Station got in on the April Fools' Day fun.

The object in this fascinating space wallpaper is Jonckheere 900 or J 900, a planetary nebula — glowing shells of ionised gas pushed out by a dying star.

See sky maps for the most promising night sky events of April 2013.

The remote piloted research aircraft sits on the ramp, awaiting a test flight.

ISS commander Chris Hadfield explains how astronauts maintains oral hygiene aboard the International Space Station.

The Aeronautics Industries Association raised more than $33,000 to show an ad that touts the US space program before Star Trek: Into Darkness.

NASA has developed a software tool (Aircraft Noise Prediction Program - ANOPP) to re-create the sound of aircraft flying overhead. Sound from today's commercial airliners are compared to NASA's hybrid wing aircraft.

Curiosity may have found traces of salty perchlorates in Rocknest, a potential hint of life's building blocks.