neptune是什么星球
Neptune是太阳系中的一颗行星，它是距离太阳最远的四颗气态行星之一，其直径约为49,244公里，比地球稍大一些。Neptune的大气层主要由氢、氦和甲烷组成，因此呈现出深蓝色的外观。它的轨道周期约165年，在太阳系中的位置位于天王星的外侧。
neptune
Neptune is the eighth and farthest known planet from the Sun in the Solar System. It is a gas giant and has the fourth-largest planetary radius and the third-largest planetary mass in the Solar System. It is named after the Roman god of the sea and has a blue color due to the presence of methane in its atmosphere.