ESA Astronaut Andreas during a simulation inside the full-scale mockup of the Soyuz capsule: View 2

ESA Astronaut Andreas during a simulation inside the full-scale mockup of the Soyuz capsule: View 1 | European Space Agency

The @SpaceX #Dragon sails over a cloudy #Sidney, #Australia as it departs the #ISS | NASA Astronaut Reid Wiseman | International Space Station

The @SpaceX #Dragon sails over a cloudy #Sidney as it departs the #ISS pic.twitter.com/ypaMndb5cI

— Reid Wiseman (@astro_reid) October 25, 2014

Ambition: The Film [A Must See!]

Ambition: The Film [A Must See!]

'Cosmos' star Neil deGrasse Tyson dazzles with science and humor

A 3D Map of the Adolescent Universe | Berkeley Lab

A 3D Map of the Adolescent Universe | Berkeley Lab

The Omega Nebula (M17)

Halley's Comet

NASA Mars Curiosity Rover Mastcam View: Sol 780

A lonely tree stretches for the auroras in Arctic Norway.

Partial Solar Eclipse | NASA

"Hanging on" | Russian EVA-40 | International Space Station

New Caledonia, Pacific Ocean | International Space Station

Namibian Desert, Africa: View 2 | International Space Station