What's Hot This Week Spinning Stars Help Scientists 'Weigh' Our Sun's Planets By Denise Chow A new method for "weighing" the planets in our solar system - one that relies on the radio signals delivered from highly magnetized spinning stars - has been developed by an international research team.     New Fireball on Jupiter Spotted By Skywatchers By Denise Chow Amateur skywatchers have spotted what appeared to be a new fireball from yet another apparent impact on Jupiter - the third in 13 months for the gas giant.     Sponsored by: NASA to Reveal Big News From Planet-Hunting Spacecraft Thursday Solar System May Be 2 Million Years Older Than Thought Farthest Full Moon of 2010 on Tuesday Is Smallest, Too Video - Dancing Rover: NASA's Moon & Mars ATHLETE Busts A Move FAQ: How Do Astronauts Take Spacewalks?

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