NASA ScienceCasts: The Lasting Impacts of Comet Shoemaker-Levy 9

In July 1994, astronomers around the world watched as the fragments of comet Shoemaker-Levy 9 slammed into the planet Jupiter. NASA Science: Click here to see more videos:

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ScienceCasts: One-Carbon Metabolism on the Space Station More from the ISS: For the first time, researchers have identified a genetic marker associated with a spaceflight medical issue. It is in the enzymes associated with the "1 carbon pathway." Click here to see more videos: