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What is a Solstice?

What is the definition of a solstice, and when do they happen? Is the winter solstice always the first day of winter? Find out what causes these bi-annual astronomical events, as well as how they bring about the shortest and longest days of the year.

NASA Sets Out to 'Touch the Sun'—Here's How

By boldly going where no spacecraft has gone before, the Parker Solar Probe will attempt to solve big mysteries about our nearest star.

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