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This is an image of Neptune and its famous Great Dark Spot
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NASA

Discover Neptune

Neptune was discovered in 1846. But it wasn't discovered using a telescope. Scientists used math instead! They watched Uranus and saw that its orbit was doing weird things. They knew another planet had to be changing it. They were right!

Neptune's largest moon, Triton, was discovered at the same time as Neptune. Another moon called Nereid was found in 1949. Neptune's other six moons were found by Voyager II in 1989. Voyager II took many pictures of Neptune and its moons. Almost everything we know about this planet came from the Voyager II mission.

Neptune is usually the eighth planet out from the Sun. But sometimes Pluto actually crosses in front of it! Neptune was named after the ancient god of the seas.

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Science, Evolution, and Creationism

How did life evolve on Earth? The answer to this question can help us understand our past and prepare for our future. Although evolution provides credible and reliable answers, polls show that many people turn away from science, seeking other explanations with which they are more comfortable....more

Triton

Triton was discovered by W. Lassell in 1846. Of the 8 moons, it is the 2nd farthest from Neptune. Triton may be one of the largest of the icy moons with a diameter that is about half the distance across...more

Neptune

Neptune was the name that ancient Romans gave to the Greek god of the sea and earthquakes, Poseidon. Neptune was depicted as a bearded man with long hair, holding a trident and accompanied by dolphins...more

Neptune's Moons and Rings

Neptune has // Call the moon count function defined in the document head print_moon_count('neptune'); moons. It also has rings, but its rings are different from Saturn's. Neptune's largest moon is named...more

A Look at the Inside of Neptune

The Giant planets do not have the same kind of layers inside that the Earth-like planets do. The history of the giant planets was so different that they formed with much more gas and ice on the inside....more

The Poles of Neptune and Its Moons

The South Pole of the planet Neptune is a bit strange. Triton, Neptune's largest moon, also has interesting poles. Neptune is tilted on its axis by about 28. That isn't so strange... Earth is tilted,...more

A Look at what Neptune's Atmosphere is Made of

The atmosphere of Neptune is a lot like that of Uranus, and unlike that of Saturn and Jupiter. On Jupiter and Saturn, the atmosphere is mostly made of the simple molecules hydrogen and helium. The atmosphere...more

The Origin of an Atmosphere

There are four ideas for where the atmosphere comes from: 1. that the planet-elements which made the planets made the atmosphere too, 2. that the atmosphere was drawn to the planet from the cloud out of...more

Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF