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Mercury's Surface Resembles Rare Meteorites

New information from NASA's MESSENGER probe suggests that the mysterious innermost planet is much more similar to certain meteorites than to other planets in the solar system

September 25, 2012 — Charles Q. Choi and

Why Aren't There Any Openly Gay Astronauts?

The lack of even one openly gay or lesbian living astronaut in the history of American spaceflight may reflect the culture at the NASA astronaut office

July 25, 2012 — Natalie Wolchover and
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