黄道平面是一个假想的平面，理论上它包含了地球环绕太阳运行的轨道。
The ecliptic plane is defined as the imaginary plane containing the Earth's orbit around the sun.
太阳系中的每个行星环绕太阳运行的轨道都比它的内邻星要长。
Each of the planets in our solar system takes a longer path round the Sun than its neighbour.
小行星是较小的行星，它们中的大部分在火星和木星轨道间的小行星带中环绕太阳运行。
Asteroids are minor planets, most of which circle the sun in a region known as the asteroid belt, between the orbits of Mars and Jupiter.
他成功地指出，根据行星环绕太阳运行一圈的时间，就可以精确地测算出太阳对这个星体的引力。
He succeeded in proving that, knowing the time of a planet's revolution around the sun, we can determine precisely with what force the attractive power of the sun affects it.
细小的原子核内含不带电荷的中子及带正电荷的质子，而带负电荷的电子则沿轨道环绕原子核运行，情况就好像行星环绕太阳运行一样。
The nucleus consists of uncharged neutrons and positively charged protons. negatively charged electrons travel around the nucleus in their orbits, similar to the way planets moving around the sun.
天文学家已经探测到太阳系外超过四百颗环绕恒星运行的行星。
Astronomers have detected more than 400 planets orbiting stars beyond our solar system.
太阳系外行星搜索者宣布发现了一个新行星，环绕其遥远恒星的可居住带运行，这一区域既不太热，也不太冷地区有稳定的液态水，有可能成为生命的一个立足之地。
Exoplanet hunters announced a new world orbiting in its dim star's habitable zone, the not-too-hot, not-too-cold region where liquid water is stable and life could potentially find a foothold.
大部分彗星主要由冰块构成，环绕太阳系黑暗的边缘运行，几乎超出了太阳的引力范围。
Composed primarily of ices, most comets circle the dark fringes of the solar system, barely within the sun's gravitational grasp.
它的母恒星与太阳相似，这又与其他两个候选外行星不同，其他两个候选外行星都环绕较冷的、较昏暗的恒星运行。
Its parent star is similar to the sun, again unlike those of the other two candidates, both of which orbit cooler, dimmer stars.
美国宇航局的科学家们发现，至少有七颗地球巨细的行星环绕着太阳系外的一颗临近恒星运行，每颗行星都可能适宜生命体保存。
NASA scientists have discovered at least seven Earth-sized planets, each potentially capable of hosting life, orbiting a nearby star just outside the solar system.
月亮被称为卫星，因为它不仅环绕太阳，而且也围绕地球运行。
The moon is called a satellite because it goes round our earth as well as round the sun.
月亮被称为卫星，因为它不仅环绕太阳，而且也围绕地球运行。
The moon is called a satellite because it goes round our earth as well as round the sun.
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