
Seen shortly after local Martian sunrise, clouds gather in the summit pit, or caldera, of Arsia Mons, a giant volcano…

The Lake Fire began on June 17, 2015 and has already grown in size to 11,000 acres.

This image of noctilucent clouds is a composite of several Aeronomy of Ice in the Mesosphere (AIM) satellite passes over…

NASA's Cassini imaging scientists processed this view of Saturn's moon Dione, taken during a close flyby on June 16, 2015.

NASA's Cassini imaging scientists processed this view of Saturn's moon Dione, taken during a close flyby on June 16, 2015.

On June 3, members of the Green Propellant Infusion Mission (GPIM) project completed the fourth hot-fire acceptance test on a…

A laterally oriented structure in the Sun's corona seemed to balance itself above the Sun's surface for at least two…

European Space Agency astronaut Timothy Peake awaits the start of a spacewalk training session.

Official insignia and patch of Expedition 46.

Official NASA portrait of British astronaut Timothy Peake a member of Expedition 45 and 46.