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2. In Depth | Neptune – NASA Solar System Exploration

   solarsystem.nasa.gov/planets/neptune/in-depth.amp

   Dark, cold, and whipped by supersonic winds, ice giant Neptune is the eighth and most distant planet in our solar system. More than 30 times as far from the Sun as Earth, Neptune is the only planet in our solar system not visible to the naked eye.

3. 10 Need-to-Know Things About Neptune - NASA Solar System...

   solarsystem.nasa.gov/module/94

   Neptune orbits our Sun, a star, and is the eighth planet from the Sun at a distance of about 2.8 billion miles (4.5 billion kilometers).

4. Neptune By the Numbers – NASA Solar System Exploration

   solarsystem.nasa.gov/neptune-by-the-numbers

   Neptune is the eighth and most distant planet from the Sun. It’s the fourth largest, and the first planet discovered with math.

5. What is a Planet? | Planets – NASA Solar System Exploration

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

   A planet is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit.

6. Planet Compare - NASA Solar System Exploration

   solarsystem.nasa.gov/planet-compare

   Planet Compare More Destinations Click for more Jupiter Click for more Earth Click for more Mercury Click for more Mars Click for more Venus Click for more ... Neptune; DWARF PLANETS Pluto; Ceres; Makemake; Haumea; Eris; HYPOTHETICAL Planet X; Moons. About Moons; BY DESTINATION Earth (1) Mars (2) Jupiter (95) Saturn (83) Uranus (27) Neptune (14)

7. In Depth | Our Solar System – NASA Solar System Exploration

   solarsystem.nasa.gov/solar-system/our-solar-system/in-depth.amp

   Our solar system extends much farther than the eight planets that orbit the Sun. The solar system also includes the Kuiper Belt that lies past Neptune's orbit. This is a sparsely occupied ring of icy bodies, almost all smaller than the most popular Kuiper Belt Object – dwarf planet Pluto.

8. 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.

9. RPS 3D Viewer - NASA Solar System Exploration

   solarsystem.nasa.gov/rps-3d

   NASA’s real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system.

10. In Depth | Triton – NASA Solar System Exploration

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

    Triton is the largest of Neptune's 13 moons. It is unusual because it is the only large moon in our solar system that orbits in the opposite direction of its planet's rotation―a retrograde orbit. Scientists think Triton is a Kuiper Belt Object captured by Neptune's gravity millions of years ago.

11. Recipe for Neptune Revealed by Scientists - NASA Solar System...

    solarsystem.nasa.gov/news/164

    Scientists would expect Neptune to be only about 46.6 Kelvins (-375 degrees Fahrenheit), if its only source of heat were sunlight. According to Orton, it can be deduced from this that Neptune must have an internal heat source.