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Meet some of the first female space explorers. (via LiveScience)

A simple phone call

NGC 6357: Cathedral to Massive Stars Image Credit: NASA, ESA and Jesús Maíz Apellániz (IAA, Spain) Explanation: How massive can a normal star be? Estimates made from distance, brightness and standard solar models had given one star in the open cluster Pismis 24 over 200 times the mass of our Sun, nearly making it the record holder.

The moon and Venus as seen by the Clementine probe in 1994.

The Pleiades M45 A Cluster, also known by various other names such as "Subaru" and "the Seven Sisters"

A scanning electron microscope image of spider silk glands making a thread originally from Dennis Kunkel Microscopy.

Super-sharp image of the Egg Nebula imaged with adaptive optics at Keck Observatory.

Comet Lovejoy is visible near Earth's horizon in this nighttime image photographed by NASA astronaut Dan Burbank, Expedition 30 commander, onboard the International Space Station on Dec. 22, 2011.