10 THINGS February 25

This Week: Pioneer Days

Someone’s got to be first. In space, the first explorers beyond Mars were Pioneers 10 and 11, twin robots who charted the course to the cosmos.

Image of the Week


A Girl Scout waits to look through a telescope at White House campout in 2015,

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Featured Video

How Sunlight Pushes Asteroids


Rotating asteroids have a tough time sticking to their orbits. Their surfaces heat up during the day and cool down at night, giving off radiation that can act as a sort of mini-thruster.
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