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a creature that is believed to exist in other worlds or planets
外星人, 外星生物
the universe beyond the atmosphere of the earth
太空, 宇宙
all that exists in the physical world, such as space, planets, galaxies, etc.
宇宙, 宇宙体
any of the rocky bodies orbiting the sun, ranging greatly in diameter, also found in large numbers between Jupiter and Mars
小行星, 星体
a place in the space with such high gravity that pulls in everything, even light
黑洞, 暗洞
the sun and the group of planets orbiting around it, including the earth
太阳系, 太阳系的行星
the 2nd planet of the solar system located between Mercury and earth
金星, 维纳斯
the 5th and the largest planet of the solar system located between Mars and Saturn
木星, 朱庇特
the 6th planet of the solar system located between Jupiter and Uranus, which has rings around it
土星, 土星（第六行星）
the 7th planet of the solar system with a blue-green color located between Saturn and Neptune
天王星, 乌ranus星
a scientist who studies or observes planets, stars, and other happenings in the universe
天文学家, 天文工作者
the act of an aircraft or spacecraft arriving on the ground or a solid surface
着陆, 下降
situated on the outside of something else
外层的, 外部的
the path an object in the space follows to move around a planet, star, etc.
轨道, 圆轨道
to move around a star, planet, or a large object in space
围绕, 绕行
an object sent into space to travel around the earth and send or receive information
卫星, 人造卫星
the process by which an aircraft leaves the ground and starts to fly
起飞, 腾飞
a vehicle designed to travel in space
宇宙飞船, 航天器
a large structure used as a long-term base for people to stay in space and conduct research
空间站, 太空站
a period during which an astronaut moves outside an spacecraft in space, typically to perform repairs or experiments
太空行走, 舱外活动
a piece of equipment by which the far objects, particularly those in space, are made clearly visible
望远镜, 天文望远镜
