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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 is an ice giant. Most of its mass is a hot, dense fluid of "icy" materials – water, methane and ammonia – above a small rocky core.

4. Planet Compare - NASA Solar System Exploration

   solarsystem.nasa.gov/planet-compare

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

5. 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.

6. 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.

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

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

   It is unlike the terrestrial planets (Mercury, Venus, Earth, Mars), or the gas giants (Jupiter, Saturn), or the ice giants (Uranus, Neptune). Charon, its huge satellite, is nearly half the size of Pluto and shares Pluto's orbit.

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. 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.

10. Neptune By the Numbers – NASA Solar System Exploration

    solarsystem.nasa.gov/neptune-by-the-numbers/?intent=121

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

11. Neptune - NASA Solar System Exploration

    solarsystem.nasa.gov/module/83

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