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Watch The Expanding Universe online: Episode 3 The Planets

"The Planets" explores our solar system and the cosmic bodies located within it. It looks at the way scientific study and technology has advanced to the point where mankind can take a closer look at the planets and better understand them. From the manned landing on the Moon to robotic probes on Mars to exploratory spacecraft like Voyager launched into the deep reaches of space, our comprehension of the planets has improved a great deal over the course of the 20th century into the 21st. "The Planets" details the ways in which human beings have slowly but surely begun to better understand our solar system through advancing technology, and what sort of interesting scientific information has been discovered as a result.

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