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.
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