先列这些:universe Spaceknown universeobservable universevisible universe total universeShape of the universeLarge-scale structure of the cosmos finite or infinite space-time continuumspaceship;spacecraft world outlook 宇宙观Cosmic latte - the color of the universe cosmic inflationcosmic microwave Cosmology Cosmos macrocosmos cosmologistastronomerastronautlight yearsgalaxy galaxy clustersMultiverse (Science, including Chaotic inflation theory, Bubble universe theory (sometimes just Bubble theory), Many-worlds interpretation )Parallel universe (fiction)Time travel Grandfather paradox Hubble's LawThe Absolute Time loop UFO Eternity Big bang theoryAlbert Einsteinsky"Big Crunch"string theory
轨道[guǐ dào]track; orbit; trajectory; path; pathway举例：1你将在8号轨道找到你的列车。You'll find your train at track 8. 2卫星被射入环绕月球的轨道。The satellite was launched into orbit around the moon. 3生产已经走上轨道。Production has already been put on the right track.
angelwhere？
