Explore the relative sizes of the planets in our solar system in this video adapted from NOVA. Host Neil deGrasse Tyson and planetary scientist Mark Sykes create a scale model that shows the relative sizes of the planets, although it does not depict the distances between them. A giant balloon (8 feet in diameter) represents the Sun while balls of varying size represent the planets. Each of the planets is compared to Pluto, which was once known as the ninth and smallest planet but was reclassified as a dwarf planet in 2006.
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