Keyword Analysis & Research: nine

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What are facts about the nine planets?

Historically, there have been nine planets in the solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. However, in 2006, the International Astronomical Union decided to reclassify Pluto as a dwarf planet, reducing the official number of planets to eight.

What is the ninth planet?

Clyde Tombaugh 's discovery of Pluto in 1930 appeared to validate Lowell's hypothesis, and Pluto was officially named the ninth planet. In 1978, Pluto was conclusively determined to be too small for its gravity to affect the giant planets, resulting in a brief search for a tenth planet.

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