Winners of International Earth & Sky Photo Contest!

This year's winners were selected from images taken in 55 countries during 2013 and 2014.

Rosetta spacecraft sees target comet wake up, then go quiet again

An April 2014 image of Comet 67P/Churyumov-Gerasimenko showed activity, as the comet nears the sun. But a June 4 image shows the comet has quieted again.

International Space Station sends a laser message from space

On June 5, astronauts aboard ISS used a beam of laser light to send an HD video to researchers waiting below.

Hubble Space Telescope to seek spacecraft target beyond Pluto

NASA okays the use of the Hubble Space Telescope in the search for an object the New Horizons spacecraft can visit after its Pluto encounter in 2015.

Physicist and artist unveil designs for warp-speed spacecraft

The technology needed to create a faster-than-light spacecraft doesn't exist yet. Will a spacecraft like this one someday carry humans to the stars?

Mercury passing in front of the sun, seen from Mars

Transit of planet Mercury across the sun on June 3, as seen from Mars by a camera on the Curiosity rover.

Solar maximum is back!

Solar Max has arrived, but this "Mini Max" is not like any other solar maximum of the Space Age.

Far side of the moon mystery solved

When spacecraft first transmitted the images of the moon's far side to Earth, we saw the lunar farside lacks the large dark areas called maria, or seas. Why?

X2.2 solar flare June 10

This flare is classified as an X2.2 flare. X-class denotes the most intense flares, while the number provides more information about its strength.

Astronauts aboard the ISS on why their job is awesome and what they’re doing

Do these guys have the coolest jobs in the universe?