1.
By definition, interplanetary travel is travel between bodies in a given star system.
星系旅行是指在给定的行星系统内在不同星体间的旅行。
2.
It is reasonable to suppose that other stars are also attended by planetary system.
有理由猜测别的恒星也伴有行星系统。
3.
If one-third of the stars are single stars with planets, then planetary systems are born, on the average, every three years.
如果这些恒星中有三分之一是拥有行星的单星，那么平均每三年就会诞生一个行星系。
4.
The planets of our solar system are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
我们太阳系的行星有水星、金星、地球、火星、木星、土星、天王星、海王星。
5.
transit navigation satellite system
“经行式”航行卫星系统
6.
The planets of our solar system are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto.
我们太阳系的行星有水星、金星、地球、火星、木星、土星、天王星、海王星和冥王星。
7.
The branch of astronomy that deals with the planets, satellites, and meteors of the solar system.
行星学天文学的一个分支，研究太阳系中的行星、卫星和流星
8.
EVOLUTIONARY RELATION BETWEEN METEORITES, METEOROIDS AND ASTEROIDS OR COMETS
陨石、流星体与小行星及彗星的演化关系
9.
Neptune is one of the farthest planets of the solar system.
海王星是太阳系中最远的行星之一。
10.
Com-Scan has detected an energy field protecting an area around the sixth planet of the Hoth system.
能源盾保护赫斯星系的第六个行星
11.
Research on the Virtual Testing System of Star Gear Planet Reducer
星齿行星减速器虚拟测试系统的研究
12.
We know that the universe is filled with stars and suns and planets and systems.
我们知道宇宙充满了各种恒星、行星、各种星座、星系。
13.
Most of the exoplanets discovered so far are much closer to their host stars than the ice line.
至今所发现的系外行星中，大多行星同主星的距离小于冰线。
14.
The formation of the satellite systems of the giant planets parallels in many respects the formation of the planets.
大行星的卫星系统的形成在许多方面相似于行星的形成。
15.
"Astronomically, it tells me that there are millions of galaxies and billions of planets.
"从天文学上讲，有无数个星系和成千上万颗行星。
16.
Saturn is one of the giant outer planets of our solar system.
土星是太阳系里一颗巨大的外行星之一。
17.
Jupiter has the distinction of being the largest planet.
木星的特点在于它是太阳系中最大的行星。
18.
Neptune is the farthest planet from the Sun.
海王星是太阳系中距离太阳最远的行星。