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Which planet is closest to the sun?
Mercury takes only 88 Earth days to orbit the sun.
A rare planetary alignment is lighting up the night sky—here’s how to see it
Though the planets are always “aligned,” seeing more than four in the sky is more uncommon. February’s lineup is a chance to ...
Look up! You don’t want to miss the ‘planetary parade’
This month, six of the planets will be visible in the night sky in an event called a planetary parade. Here’s how kids can ...