Cosmos宇宙world世界milky way银河solar system太阳系interplanetary形星际的sky天zenith天顶fixed star恒星planet行星asteroid小行星satellite卫星shooting star流星Mercury水星Venus金星earth地球Mars火星Jupiter木星Saturn土星Uranus天王星Neptune海王星Pluto冥王星morning star晨星evening star昏星aureole光环eclipse食astronaut宇航员shuttle航天飞机east