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February 18, 1930 Pluto discovered by Clyde Tombaugh. It was

February 18, 1930 Pluto discovered by Clyde Tombaugh. It was the first planet discovered by an American. Tombaugh was hired to search for proof of theories of another planet beyond Uranus. Clyde Tombaugh. Photo from NASA. 1950s

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February 18, 1930 Pluto discovered by Clyde Tombaugh. It was

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  1. February 18, 1930 Pluto discovered by Clyde Tombaugh. It was the first planet discovered by an American. Tombaugh was hired to search for proof of theories of another planet beyond Uranus. Clyde Tombaugh Photo from NASA

  2. 1950s Gerard Kuiper suggested that Pluto isn't alone, but is the brightest of a collection of objects orbiting beyond Neptune. The Kuiper Belt is named after him. Gerard Kuiper Photo from NASA

  3. 1965 Pluto's 3:2 orbit resonance with Neptune discovered.

  4. 1976 Discovery of methane on Pluto.

  5. July 1978 Charon discovered by Jim Christy of U.S. Naval Observatory. It is in synchronous orbit with Pluto, about 19,400 kilometers (12,050 miles) away. It completes its orbit every 6.4 Earth days.

  6. 1979-1999 Pluto was closer to the Sun than Neptune, because of its elliptical, off-centered orbit of the Sun. It ranges from 4.4 billion kilometers away from the Sun (2.8 billion miles), to 7.4 billion kilometers (4.6 billion miles) (a mean distance of 5.9 billion kilometers).

  7. 1980 Stellar occultation - observing a star as a planet passes before it - reveals Charon's diameter to be nearly 1,200 kilometers (about 745 miles).

  8. 1980s Scientists determined that only something like the Kuiper Belt could explain short-term comets orbiting so close to our solar system. Photo from NASA The comet LINEAR

  9. 1986 First reliable radii for Pluto and Charon determined.

  10. 1987 Water and ice discovered on Charon's surface.

  11. 1988 Scientists discover Pluto's orbit to be chaotic; stellar occultation reveals Pluto's atmosphere and telescopic evidence of polar caps. Pluto, left, and Charon, right Photo from NASA

  12. 1992 Nitrogen and carbon monoxide ices found on Pluto.

  13. 1992 Astronomers at Mauna Kea Observatory in Hawaii discovered first Kuiper Belt Object (KBO), 10 times smaller than Pluto and 10,000 times fainter. Mauna Kea Observatory Photo from Southwest Research Institute

  14. 1993 Astronomers find 4 more KBOs.

  15. 1994 Astronomers find 10 more KBOs. Today, there are 1,000 "known" KBOs.

  16. May 2005 Principal Investigator Alan Stern and Project Scientist Hal Weaver lead team to discovering two more moons orbiting Pluto. They are 43,450 kilometers (27,000 miles) away from Pluto. Photo from Southwest Research Institute Alan Stern above, Hal Weaver below Photo from Johns Hopkins University Applied Physics Laboratory

  17. February 15, 2006 Hubble Space Telescope confirms presence of two additional moons orbiting Pluto. Photo from NASA Pluto left, Charon below and two newly found moons to the right

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