Two Space Shuttles, Atlantis (foreground, STS-125), and Endeavour (background, STS-400) on their launch pads at the same time, with Endeavour ready for a potential rescue mission.

HL Tau, a protoplanetary disk 450 light years away from us in the constellation of Taurus (image obtained by ALMA, ESO/NAOJ/NRAO)

The 45 year evolution of spacecraft cockpit design from NASA's Apollo to Discovery to SpaceX's Dragon.

Rockets of the world

Interesting pic of dust devil on Mars. Wondering why it appears white and not tan like the surface.