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6 天前 · 海王星以 羅馬神話 中的 尼普頓 （Neptunus）命名，因為尼普頓是海神王，所以中文譯為海王星。 天文學的符號 （♆， Unicode 編碼U+2646），是 希臘神話 的海神 波塞頓 使用的 三叉戟 。 作爲一個 冰巨行星 ，海王星的 大氣層 以 氫 和 氦 為主，還有微量的 甲烷 。 大氣層中的甲烷是行星呈現淡藍色的一部分原因 [7] [8] ，因為 天王星 大氣中存在濃霧，所以海王星的藍色比有同樣甲烷量的天王星更為鮮豔。 海王星有 太陽系 最強烈的 風 ，測量到的 風速 高達每小時2,100 公里 。 [9] 1989年 航海家2號 飛掠過海王星，對其南半球的 大暗斑 和木星的 大紅斑 做了比較。
Number Eight. Neptune is 30 AU from the Sun. Earth = 1 AU. A Neptunian Year. Neptune takes 165 Earth years to go around the Sun. Ice Giant. The most dense of the giant planets. 16 Moons. Named for sea gods and nymphs in Greek mythology. Rings and Arcs. Neptune has five rings and four more ring arcs, Solo Voyager.
Atmosphere. Magnetosphere. Introduction. Dark, cold, and whipped by supersonic winds, ice giant Neptune is 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. In 2011 Neptune completed its first 165-year orbit since its discovery in 1846.
Namesake. The ice giant Neptune was the first planet located through mathematical calculations. Using predictions made by Urbain Le Verrier, Johann Galle discovered the planet in 1846. The planet is named after the Roman god of the sea, as suggested by Le Verrier. Potential for Life. Neptune's environment is not conducive to life as we know it.
5 天前 · Neptune, third most massive planet of the solar system and the eighth and outermost planet from the Sun. Because of its great distance from Earth, it cannot be seen with the unaided eye.
海王星是太陽系八大行星中距离太陽最遠的、體積第四大的，但質量是第三大的行星。 海王星的質量約為地球的17.147倍。 海王星以羅馬神話中的尼普顿（Neptunus）命名，因為尼普顿是海神王，所以中文譯為海王星。 天文學的符號 （ ，Unicode編碼U+2646），是希臘神話的海神波塞頓使用的三叉戟。
2024年5月6日 · Structure and Surface. Neptune is encircled by six rings. Neptune, like Uranus, is an ice giant. It’s similar to a gas giant. It is made of a thick soup of water, ammonia, and methane flowing over a solid core about the size of Earth. Neptune has a thick, windy atmosphere. Time on Neptune. One day on Neptune goes by in 16 hours.
2019年3月28日 · March 28, 2019. • 6 min read. Neptune may seem like a serene sapphire world at first glance. But don't let its quiet azure hues fool you: The eighth planet from the sun is a wild child. Neptune...
2024年5月16日 · ATMOSPHERIC CONSTITUENTS. Hydrogen, Helium, Methane. Nitrogen, Oxygen. Compare all Eight Planets. The numbers displayed here are approximations. For more precise data, please visit JPL Solar System Dynamics. Page Updated: May 16, 2024. Neptune is the eighth and most distant planet from the Sun. It’s the fourth largest, and the first planet ...
Neptune Facts. Average temperature: -201°C (-331°F) where atmospheric pressure equals sea level on Earth. Average distance from Sun: 4,495 million kilometers (2,793 million miles), or 30 times farther from the Sun than Earth. Diameter: 49,528 kilometers (30,775 miles), Neptune is 3.9 times wider than Earth.
