a large structure used as a long-term base for people to stay in space and conduct research
空间站, 太空站
any of the rocky bodies orbiting the sun, ranging greatly in diameter, also found in large numbers between Jupiter and Mars
小行星
a scientist who studies or observes planets, stars, and other happenings in the universe
天文学家
the sun and the group of planets orbiting around it, including the earth
太阳系, 行星系统
a specific group of stars that form a pattern and have a name related to their shape
星座
(physics) the universal force of attraction between any pair of objects with mass
重力, 引力
a piece of rock coming from outer space that passes through the Earth's atmosphere, producing light
流星, 陨石
having or seeming to have no or little weight, caused by the absence of gravity
无重的, 失重的
a rocket that gives a spacecraft or missile the extra power it needs to leave the Earth's atmosphere
助推器, 火箭助推器
the act of counting numbers backwards to zero before the launch of a missile or spacecraft
倒计时, 反向计数
an unmanned spacecraft used to gather information from space and send it back
探测器, 宇宙探测器
(of the moon) to gradually decrease in its visible illuminated surface as it progresses from full to new moon
减弱, 衰退
(of the moon) to progressively display a larger illuminated section until it turns into a full moon
变大, 增大