a pale band of light seen in the sky at night that contains the solar system and billions of other stars
银河
a scientist who studies or observes planets, stars, and other happenings in the universe
天文学家
a specific group of stars that form a pattern and have a name related to their shape
星座
the explosion that, according to most scientists, caused the existence of the universe
大爆炸
a place in the space with such high gravity that pulls in everything, even light
黑洞
an object in space that is a mass of ice and dust and when it nears the sun it starts illuminating in the shape of a tail
彗星
a piece of rock coming from outer space that passes through the Earth's atmosphere, producing light
流星
an object sent into space to travel around the earth and send or receive information
卫星
the act of counting numbers backwards to zero before the launch of a missile or spacecraft
倒计时
a mysterious object that some people claim to have seen flying around in the sky and assume that it is a spaceship from another world
不明飞行物体
the distance that a beam of light travels in a year, equal to 9.46 trillion kilometers
光年