 A growing storm of debris flying around in space is dramatically increasing the risk of orbital crashes, and steps to avoid them will add greatly to the costs of future space flight, British space experts say. Above, a Hubble image of debris from a stellar explosion. Space around the Earth is getting crowded with debris from more mundane sources: defunct satellites, fragments of space vehicles, even paint flakes and dust
Apollo 11's 40th Anniversary 
The frozen landscape, dry valleys and active volcanoes that make up Antarctica provide a living laboratory for scientific study and a wondrous journey for those traveling to the ends of the Earth. Experience the continent with this special report.
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Air Force began upgrading its ability to predict possible collisions in space after a defunct Russian military communications satellite and a commercial U.S. satellite collided. The military says it is tracking 800 maneuverable satellites and expects to add 500 more non-maneuvering satellites by year's end.
The Green Lantern
We used to hear so much about the destruction of the Amazon, but lately not a word. So what happened: Did we save it, or not? We didn't save it, but we haven't stopped trying.
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