Tag Archives: SOLAR SYSTEM EXPLORATION FRONTIERS

PLUTO IS JUST THE BEGINNING

When I was growing up, there were nine planets in the solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. By 1989, all of those planets had been explored … except Pluto. Though it’s no longer classified as a planet by some folks, Pluto is one of the largest worlds in the outer solar system, and it remained a mystery until this week.

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