NASA's InSight Mars Lander Touches Down 1 Week from Today!

NASA's InSight lander will arrive at the Red Planet on the afternoon of Nov. 26, hopefully amid a flurry of celebratory whoops akin to those elicited by the successful touchdown of the Curiosity Mars rover on Aug. 5, 2012.

What Is a Spiral Galaxy?

A spiral galaxy has a distinct winding shape. Most of the galaxies observed by astronomers are spiral galaxies.

Pegasus, the Flying Horse, Marks Mid-Autumn Skies

Step outside this week between 6 and 8 p.m. local time and look overhead and toward the south to see one of the landmarks of the mid-autumn sky: the Great Square of Pegasus, the flying horse.