NASA shares three never-before-seen images of Mars with the caption “You have a letter from Mars” …

Thousands of bubble-like mounds of grass are found on a grass field near Olympia in Washington, DC, in the northwest. These humps are called Mima Hills, also known as Mima Prairie, and are more than two meters high and large....

At 4 billion light-years in length, the Large Quasar Group (LQG) is the largest known structure in the universe and is some 1600 times larger than the distance from the Milky Way to Andromeda.

Apollo 17 astronauts Eugene Cernan and Harrison Schmitt spent 75 hours on the moon in December 1972. They landed in the Taurus-Littrow valley of the moon Fellow traveler Ronald Evans was traveling around the moon at that time. Schmitt photographed...