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

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

This "I'm done..." board is a great way to remind students of their choices once they have completed the current activity. By having this posted as a bulletin board or poster within the room, students would have a visual reminder of the acceptable options they have while awaiting transition to the next activity. This procedure would help maintain order as well as keep faster students busy.

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

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

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.

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