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1. solarsystem.nasa.gov › planets › neptuneIn Depth | Neptune – NASA Solar System Exploration

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   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.

2. solarsystem.nasa.gov › neptune-by-the-numbersNeptune By the Numbers – NASA Solar System Exploration

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   Sep 3, 2024 · Neptune is the eighth and most distant planet from the Sun. It’s the fourth largest, and the first planet discovered with math.

3. solarsystem.nasa.gov › solar-system › our-solar-systemIn Depth | Our Solar System – NASA Solar System Exploration

   solarsystem.nasa.gov › solar-system › our-solar-system

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   Our solar system consists of our star, the Sun, and everything bound to it by gravity – the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune; dwarf planets such as Pluto; dozens of moons; and millions of asteroids, comets, and meteoroids.

4. solarsystem.nasa.gov › planets › in-depthWhat is a Planet? | Planets – NASA Solar System Exploration

   solarsystem.nasa.gov › planets › in-depth

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   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.

5. solarsystem.nasa.gov › planet-comparePlanet Compare - NASA Solar System Exploration

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   Sep 3, 2024 · 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.

6. solarsystem.nasa.gov › module › 9410 Need-to-Know Things About Neptune - NASA Solar System...

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   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).

7. solarsystem.nasa.gov › moons › neptune-moonsIn Depth | Triton – NASA Solar System Exploration

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   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.

8. solarsystem.nasa.gov › planets › hypothetical-planet-xIn Depth | Hypothetical Planet X - NASA Solar System Exploration

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   Jan 20, 2015 · Caltech researchers have found mathematical evidence suggesting there may be a "Planet X" deep in the solar system. This hypothetical Neptune-sized planet orbits our Sun in a highly elongated orbit far beyond Pluto.

9. solarsystem.nasa.gov › planets › marsIn Depth | Mars – NASA Solar System Exploration

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   Mars is one of the easiest planets to spot in the night sky – it looks like a bright red point of light. Despite being inhospitable to humans, robotic explorers – like NASA's new Perseverance rover – are serving as pathfinders to eventually get humans to the surface of the Red Planet.

10. solarsystem.nasa.gov › planets › uranusIn Depth | Uranus – NASA Solar System Exploration

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    Uranus is one of two ice giants in the outer solar system (the other is Neptune). Most (80% or more) of the planet's mass is made up of a hot dense fluid of "icy" materials – water, methane, and ammonia – above a small rocky core. Near the core, it heats up to 9,000 degrees Fahrenheit (4,982 degrees Celsius).