行星
海王星
Eighth planet from the Sun
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海王星离地球有多远？
43.4亿 km (29 AU)
它的光传到地球需要 4 小时 1 分钟。
每天远离 129万 km。
距太阳 44.7亿 km (29.9 AU)。
在 3D 中查看到访过的航天器
依据 NASA JPL Horizons 发布的轨道数据，仅含 TAKIP 已获取的飞行。
Neptune
Neptune is the eighth and farthest known planet orbiting the Sun. It is the fourth-largest planet in the Solar System by diameter, the third-most-massive planet, and the densest giant planet. It is 17 times the mass of Earth. Compared to Uranus, its neighbouring ice giant, Neptune is slightly smaller, but more massive and dense. Being composed primarily of gases and liquids, it has no well-defined solid surface.
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