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2. Kuiper Belt and Oort Cloud - NASA Solar System Exploration

   solarsystem.nasa.gov/internal_resources/1031

   Kuiper Belt are presumed to be remnants from the formation of the solar system about 4.6 billion years ago. The Kuiper Belt extends from about 30 to 55 AU and is prob-ably populated with hundreds of thousands of icy bodies larger than 100 kilometers (62 miles) across and an estimated trillion or more comets.

3. In Depth | Kuiper Belt – NASA Solar System Exploration

   solarsystem.nasa.gov/solar-system/kuiper-belt/in-depth.amp

   The Kuiper Belt represents an enormous, donut-shaped volume of space in the outer solar system. While there are many icy bodies in this region that we broadly refer to as Kuiper Belt Objects (KBOs) or trans-Neptunian objects (TNOs), they're fairly diverse in size, shape, and color.

4. New Horizons Successfully Explores Ultima Thule

   solarsystem.nasa.gov/news/807/new-horizons-successfully-explores-ultima-thule

   NASA's New Horizons spacecraft flew past Ultima Thule in the early hours of New Year's Day, ushering in the era of exploration from the enigmatic Kuiper Belt, a region of primordial objects that holds keys to understanding the origins of the solar system.

5. In Depth | Haumea – NASA Solar System Exploration

   solarsystem.nasa.gov/planets/dwarf-planets/haumea/in-depth.amp

   Dwarf planet Haumea is a member of a group of objects that orbit in a disc-like zone beyond the orbit of Neptune called the Kuiper Belt. This distant realm is populated with thousands of miniature icy worlds which formed early in the history of our solar system about 4.5 billion years ago.

6. New Horizons Spacecraft Homing in on Kuiper Belt Target

   solarsystem.nasa.gov/news/804

   After a 13-year journey, the piano-sized spacecraft has covered a distance of four billion miles to reach Ultima Thule in the Kuiper Belt — a donut-shaped region of ancient, rocky bodies beyond the orbit of Neptune.

7. Hubble to Conduct Largest-Ever Survey of Kuiper Belt

   solarsystem.nasa.gov/news/891

   At the present time, the properties of the Kuiper Belt’s unique population of binary systems can only be accurately measured with Hubble. SwRI leads this large HST project focused on characterizing the binary and color properties of over 200 unique KBOs.

8. In Depth | Eris – NASA Solar System Exploration

   solarsystem.nasa.gov/planets/dwarf-planets/eris/in-depth.amp

   Dwarf planet Eris is a member of a group of objects that orbit in a disc-like zone beyond the orbit of Neptune called the Kuiper Belt. This distant realm is populated with thousands of miniature icy worlds, which formed early in the history of our solar system about 4.5 billion years ago.

9. In Depth | Triton – NASA Solar System Exploration

   solarsystem.nasa.gov/moons/neptune-moons/triton/in-depth.amp

   Scientists think Triton is a Kuiper Belt Object captured by Neptune's gravity millions of years ago. It shares many similarities with Pluto, the best known world of the Kuiper Belt. Like our own moon, Triton is locked in synchronous rotation with Neptune―one side faces the planet at all times.

10. In Depth | Asteroids - NASA Solar System Exploration

    solarsystem.nasa.gov/asteroids-comets-and-meteors/asteroids/in-depth.amp

    Main Asteroid Belt: The majority of known asteroids orbit within the asteroid belt between Mars and Jupiter, generally with not very elongated orbits. The belt is estimated to contain between 1.1 and 1.9 million asteroids larger than 1 kilometer (0.6 miles) in diameter, and millions of smaller ones.

11. In Depth | Pluto – NASA Solar System Exploration

    solarsystem.nasa.gov/planets/dwarf-planets/pluto/in-depth.amp

    Dwarf planet Pluto is a member of a group of objects that orbit in a disc-like zone beyond the orbit of Neptune called the Kuiper Belt. This distant realm is populated with thousands of miniature icy worlds, which formed early in the history of our solar system about 4.5 billion years ago.