我们生活在一个满是岩石的行星——地球上。地球是太阳系的一部分,而太阳系包括太阳,以及由行星、小行星和彗星组成的“大家族”——它们都围绕或靠近太阳运行。行星沿着椭圆形的轨道围绕太阳运转,也就是说,它们沿着一个稍微有点扁的圆形轨道运行。你知道太阳系里有八大行星吗?太阳的引力牵引住了这些行星,因此,越接近太阳的行星运行得就越快,这样才能让自己保持平衡。 We live in a rocky planet - Earth. The Earth is part of the solar system, which includes the sun and the “big family” of planets, asteroids and comets - all running around or near the sun. The planets orbited the sun around elliptical orbits, that is, they ran along a slightly flat circular orbit. Do you know that there are eight planets in the solar system? The gravitational pull of the sun captures these planets, so the nearer the Sun’s planets run, the faster they will be able to balance themselves.