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

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

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 simple phone call

personal dry erase boards - a modern day version of the one-room-schoolhouse slates

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.

Globular Cluster Credit: NASA, ESA and H. Richer (University of British Columbia