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  1. Scott Sander Sheppard (born 1977) is an American astronomer and a discoverer of numerous moons, comets and minor planets in the outer Solar System. He is an astronomer in the Department of Terrestrial Magnetism at the Carnegie Institution for Science in Washington, DC.

    • Night and Darkness
    • Beyond Pluto
    • A Missing Planet?
    • An Unknown Past

    To do these kind of discoveries, Sheppard flies across the world to reach the best telescopes he can get his hands on. There's no way around it, as these instruments need to be far from city lights, near an ocean, and high up in the mountains. That's the recipe for the best stargazing conditions. Sheppard's discovery telescopes of choice are the Su...

    With access to these powerful tools, Sheppard and his colleagues are conducting what he calls the deepest and largest survey ever obtained for distant Solar System objects. "We've covered about 25 percent or so of the interesting sky to date," he says. Pointing the telescopes towards the darkest and coldest places of our Solar System, Sheppard is a...

    In addition to being extremely distant, the objects Sheppard and his team are finding at the fringes of our known Solar System all appear to have similarly elongated orbits aligned toward the same direction. "You just wouldn't expect that," Sheppard says. "You would expect these objects to have fairly random types of orbits." This is the case of Sh...

    Finding the planet wouldn't just add a new member to our Solar System family. It would change everything we know about our family history. Astronomers agree that things the size of Planet X can't form out where Pluto is or beyond. That far out, things are sparse. Also, the volume of space is large and only small things form (think Pluto, which is s...

  2. Scott Sheppard discovered an asteroid that orbits the Sun in just 113 days—the shortest known orbital period for an asteroid and the second shortest for any object in our Solar System after Mercury. He discovered the asteroid by looking at evening twilight images taken by Brown University’s Ian Dell'Antonio and Shenming Fu.

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  4. Oct 2, 2018 · Carnegie's Scott Sheppard and his colleagues—Northern Arizona University's Chad Trujillo, and the University of Hawaii's David Tholen—are once again redefining our Solar System's edge. They discovered a new extremely distant object far beyond Pluto with an orbit that supports the presence of an even-farther-out, Super-Earth or larger Planet X.

  5. Feb 9, 2023 · Every few years, Sheppard and his fellow astronomers take advantage of better technology and bigger telescopes to add more moons to the tally. At the moment, Jupiter holds the record for the most...

  6. Scott S. Sheppard. I am a faculty member at the Carnegie Institution for Science, Earth and Planets Laboratory in Washington, DC. My interests are in the formation and evolution of...

  7. Feb 23, 2024 · “The three newly discovered moons are the faintest ever found around these two ice giant planets using ground-based telescopes,” explained Carnegie astronomer Scott S. Sheppard. “It took special image processing to reveal such faint objects.”

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