Wikijunior:太阳系/海王星

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Neptune symbol.ant.png Solar system scale.jpg
星球资料
离太阳距离: 近:44'5963'1496千米

远:45'3687'4325千米
(第8远)

星球大小: 直径49528公里(第4大)
表面温度: 平均:-214°C
月亮: 14个
与地球比较
大小: 约地球的3.88倍
一天长短: 15小时57分59秒,约0.67个地球日
一年长短: 约等于164.79个地球年,60189个地球日
体重量度: 约地球的17.375倍

海王星有多大?[编辑]

海王星與地球大小相比較

海王星與天王星在大小上幾乎很相近。它的直徑只比天王星小一點,为49528千米左右,將近是四個地球排成一行的宽度。

海王星的表面是什麼樣的?[编辑]

The atmosphere of Neptune has some dark blue spots. When the Voyager probe went by Neptune in 1989, it saw a large one called the Great Dark Spot. In 1994, it vanished, but later reappeared.Template:An There is also a large white cloud nicknamed "Scooter." It goes around Neptune every 16 hours.Template:An The winds of Neptune are very fast, blowing at up to 2000 km per hour.Template:An That is about four times faster than the fastest recorded tornado on Earth.

它的光环是什么样子?[编辑]

海王星有一些很难观察到的黯淡的光环,由多个亮块组成。它们的形状不完整,而且不稳定。其中,最外层的一个环包含三段显著的弧。

海王星的月亮是怎么样的?[编辑]

维基儿童·太阳系

介绍


我们的太阳系


太阳


水星
金星
地球
月球
火星


木星
土星


天王星
海王星


冥王星


小行星带
彗星
柯伊伯带
奥尔特云


术语

Neptune has 13 moons. There could be more.Template:An

Inner Moons[编辑]

There are five small potato-shaped moons orbiting close to Neptune.

Proteus[编辑]

Proteus is a dark moon about 418 km across. It has an irregular shape. In Roman mythology Proteus was a sea-god who could change into any shape he wanted.Template:An

Triton[编辑]

Triton is the largest moon of Neptune. Scientists think that it is a lot like Pluto. It is 2700 km across. It is made of rock and ice. It has a surface temperature of −235 °C Triton has a very thin atmosphere made up of nitrogen and a little methane.

There are volcanoes that have eruptions of liquid nitrogen, dust or methane compounds. The eruptions happen because of the seasons. There are few craters because the eruptions cover them up. There are ice caps that change sizes with the seasons. There are also ridges and valleys. They may have formed because of repeated freezing and thawing.

An interesting thing about Triton's orbit is that it goes around Neptune in the opposite direction that Neptune's rotates. Because of this, scientists think that Triton was captured by Neptune long ago. In Roman mythology, Triton was the son of Neptune.Template:An

Nereid[编辑]

Nereid is an irregularly shaped moon about 340 km across. Its orbit is very eccentric or noncircular. It may have been captured by Neptune or moved into the eccentric orbit by Triton's gravity when Triton got captured. In Roman mythology Nereids were sea nymphs.Template:An

Outer Moons[编辑]

There are five other known moons. They are small potato-shaped moons far from Neptune. There might be more we haven't seen yet.

How long is a day on this planet?[编辑]

A day on Neptune lasts 16 hour and 7 minutes.Template:An

How long is a year on this planet?[编辑]

One year on Neptune is about 165 Earth years, or 60,265 days.Template:An

What is it made of?[编辑]

Neptune is made of rock and metal in the core. The core is probably bigger than Uranus's because Neptune weighs more, but is the same size. Around the core is rock, water, ammonia and methane. The atmosphere is made of hydrogen and helium. Lower down in the atmosphere, there is methane and ammonia too. The methane makes Neptune look blue-green.Template:An

File:Adreadoriaasneptunebyagnolobronzino.jpeg
Artistic impression of Neptune

How much would Neptune's gravity pull on me?[编辑]

If you were floating close to the cloud tops of Neptune, it would pull you down with a force only a little stronger than the force of Earth's gravity.Template:An The effects of Neptune's larger radius and its mass almost cancel out, making the force only a little bigger.

Who is it named after?[编辑]

海王

名称由来

星球:罗马神话:Neptune(拉丁文)
  • 中文:尼普顿(海神)
Andrea Doria as Neptun by Angelo Bronzino.jpg

Neptune is named after the Roman god of the seas, also known as Poseidon in ancient Greece.