But as detection methods improved, astronomers began to find planets closer in size to Earth and planetary systems that contain nearly as many planets as our solar system.
但随着观测手段的提高，天文学家们开始找到与地球的大小相近的行星，以及与我们的太阳系拥有大致相同数目行星的行星系统。
The orbit of Venus, the 2nd planet outward form the sun, comes closer to Earth than any other planetary orbit.
金星的轨道，围绕太阳外运行的第二颗行星，它比任何其它的行星轨道都靠近地球。
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