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。
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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