Why is the Sun's million-degree corona, or outermost atmosphere, so much hotter than the Sun's surface? This question has baffled astronomers for decades.
What is a planet? For generations of kids the answer was easy. A big ball of rock or gas that orbited our Sun, and there were nine of them in our solar system. But then astronomers started finding more Pluto-sized objects orbiting beyond Neptune.
Dr. Philip M. Sadler of the Harvard-Smithsonian Center for Astrophysics (CfA) has been awarded the 2014 Technology and Innovation Award from the International Planetarium Society.
(617) 495-7462Christine Pulliam
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