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  2. The tiny planet-not-planet that could: Pluto was discovered ...

    www.aol.com/short-uneventful-life-pluto-planet...

    When did Pluto stop being a planet, and why? Pluto was always in a tough spot when it came to being a planet. Just 1,477 miles across, it's only one-fifth the diameter of Earth.

  3. Pluto - Wikipedia

    en.wikipedia.org/wiki/Pluto

    Pluto's diameter is 2 376.6 ± 3.2 km [5] and its mass is (1.303 ± 0.003) × 10 22 kg, 17.7% that of the Moon (0.22% that of Earth). [125] Its surface area is 1.774 443 × 10 7 km 2 , or just slightly bigger than Russia or Antarctica (particularly including the Antarctic sea ice during winter).

  4. Timeline of astronomy - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_astronomy

    1.6 380 BC. 1.7 350 BC. 1.8 270 BC. 1. ... it appeared larger than Pluto and was called the tenth planet. ... 2008 TC3 becomes the first Earth-impacting meteoroid ...

  5. What Makes Pluto So Intriguing - AOL

    www.aol.com/news/makes-pluto-intriguing...

    It takes Pluto slightly over 248 Earth years to orbit the sun, which means that on March 23, 2178, one Plutonian year will have elapsed since the dwarf planet was first spotted, on Feb. 18, 1930.

  6. Timeline of discovery of Solar System planets and their moons

    en.wikipedia.org/wiki/Timeline_of_discovery_of...

    The timeline of discovery of Solar System planets and their natural satellites charts the progress of the discovery of new bodies over history. Each object is listed in chronological order of its discovery (multiple dates occur when the moments of imaging, observation, and publication differ), identified through its various designations (including temporary and permanent schemes), and the ...

  7. Astronomers have for decades tried to figure out how Pluto ...

    www.aol.com/news/did-pluto-large-moon-charon...

    Pluto likely acquired large moon Charon in a “kiss and capture” collision billions of years ago. It may have created a subsurface ocean on the icy dwarf planet.

  8. Clyde Tombaugh - Wikipedia

    en.wikipedia.org/wiki/Clyde_Tombaugh

    Clyde William Tombaugh (/ ˈ t ɒ m b aʊ /; February 4, 1906 – January 17, 1997) was an American astronomer.He discovered Pluto in 1930, the first object to be discovered in what would later be identified as the Kuiper belt.

  9. New Horizons spacecraft captures first images of Pluto moons

    www.aol.com/article/2015/02/19/new-horizons...

    NASA launched the New Horizon spacecraft in 2006 to learn more about the icy dwarf planet Pluto. Here are some of the first photos from that mission, taken from between 125 and 115 million miles away.