Space Junk Reaches Tipping Point

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Space Junk Reaches Tipping Point         It may soon become too dangerous to venture into low-Earth orbit. Read More WATCH VIDEO: NASA Tries to Break Satellites Is the equipment really ready for orbit? How Should We Remember 9/11?         While Americans have an admirable tendency to focus on the positive, historians say it's critical to also remember tragedy.  Read More WATCH VIDEO: 9/11 Remembered in Language Learn how our national lexicon has changed. The Lost Apollo Missions         The real story of the lost missions of Apollo flights 18, 19 and 20 is a sad, blank chapter in American space history.  Read More WATCH VIDEO: Apollo 11 Film Restored Preserving key moments from the lunar excursion. Shaggy, Shovel-Headed Rhino Evolved in Tibet         The newly identified rhino, dating to 3.7 million years ago, shows many Ice Age animals first adapted to the cold in Tibet. Read More WATCH VIDEO: Zoo DNA Lab See how a genetics lab uses animal DNA to diagnose diseases. Follow Discovery News on Facebook! Get your sci-tech headlines all day on Twitter too! Follow us @Discovery_News. At Discovery we value your privacy. If you would like to be removed from Discovery News emails like this, please click here to our subscription center, where you can manage your account. We recently updated our privacy policy. This policy is effective as of 10/30/07. To see new policy click here . Discovery Communications, LLC One Discovery Place Silver Spring, MD 20910 © 2010 Discovery Communications, LLC