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  1. science.nasa.gov › dwarf-planets › plutoPluto - NASA Science

    It found that Pluto is a complex world with mountains, valleys, plains, craters, and apparently even glaciers. Pluto was discovered in 1930 by astronomer Clyde Tombaugh at the Lowell Observatory in Flagstaff, Arizona. It was named by 11-year-old Venetia Burney of Oxford, England.

  2. en.wikipedia.org › wiki › PlutoPluto - Wikipedia

    In April 2024, Arizona (where Pluto was first discovered in 1930) passed a law naming Pluto as the official state planet. Orbit Animation of Pluto 's orbit from 1850 to 2097 Sun · Saturn · Uranus · Neptune · Pluto. Pluto's orbital period is about 248 years.

  3. Discovered in 1930, Pluto was long considered our solar system's ninth planet. But after the discovery of similar intriguing worlds deeper in the Kuiper Belt, tiny Pluto was reclassified as a dwarf planet in 2006 by the International Astronomical Union.

  4. Discovered in 1930, Pluto was long considered our solar system's ninth planet. But after the discovery of similar intriguing worlds deeper in the distant Kuiper Belt, icy Pluto was reclassified as a dwarf planet. Pluto is only about 1,400 miles wide. At that small size, Pluto is only about half the width of the United States.

  5. 18 de feb. de 2015 · By Jennifer Latson. February 18, 2015 11:30 AM EST. W hen it was first discovered, Pluto was the coolest planet in the solar system. Before it was even named, TIME surmised that “the New...

  6. 17 de mar. de 2017 · Jennifer Rosenberg. Updated on March 17, 2017. On February 18, 1930, Clyde W. Tombaugh, an assistant at the Lowell Observatory in Flagstaff, Arizona, discovered Pluto. For over seven decades, Pluto was considered the ninth planet of our solar system. The Discovery.

  7. 3 de mar. de 2010 · Pluto, once believed to be the ninth planet, is discovered at the Lowell Observatory in Flagstaff, Arizona, by astronomer Clyde W. Tombaugh.