Top news for December 21, 2008

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NASA's InSight lander detects space rocks as they slam into Mars

NASA chief says cooperation with China in space is up to China

NASA's DART asteroid-impact mission will be a key test of planetary defense

Fossil Eggs Show Dinosaur Decline Before End-Cretaceous Extinction

China Mars mission data offers evidence for ancient ocean

Gel treats gum disease by fighting inflammation

On This Day In Space: Nov. 18, 2013: NASA launches MAVEN orbiter to Mars

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Best telescopes for kids: Top picks for seeing the moon, stars, planets & more