The largest terrestrial planet, Earth has a diameter only one quarter as great as the diameter of the smallest Jovian planet, Neptune, and its mass is only one seventeenth as great.

最大的类地行星地球的直径仅仅是最小的类木行星海王星的四分之一，而且地球的质量仅仅是其质量的十七分之一。

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Scientists want to bring a chunk of the red planet down to Earth on what's called a sample-return mission.

科学家们希望将这颗红色星球的一大块带回地球，进行所谓的取样返回任务。

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After many years of scrutinizing, astronomers have found a planet that is similar to the Earth.

经过多年的仔细研究，天文学家发现了一颗与地球相似的行星。

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Also left forever on the moon is a sign with these words: "Here men from the planet Earth first set foot on the Moon July,nineteen sixty-nine A.D.

VOA: special.2009.07.15

At this moment I wasn't just looking down at the Earth but I was looking at a planet hanging in the blackness of space.

MSN: Earth From Space: An Astronaut's Quest to Protect Our 'Fragile Oasis' - Technology & science - Space - Space.com | NBC News

Plainly, Asia and the rest of the world could be facing a major struggle to ensure that the impoverished of Planet Earth wouldn't be written off by a group of American experts, no matter how brilliant and well-meaning they may be.

CNN: ASIANOW - Asiaweek | Intelligence | The Week Ahead

By this standard, the planet Earth has a value of one.

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