If the Earth-Sun distance were as little as 1 percent larger, runaway glaciation on Earth about 2 billion years ago would have caused the oceans to freeze and remain frozen to this day.

如果地球与太阳的距离再大哪怕1%，大约20亿年前地球上失控的冰期就会导致海洋冻结，并一直冻结到今天。

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If the Earth-Sun distance were as little as 1 percent larger, runaway glaciations on Earth about 2 billion years ago would have caused the oceans to freeze and remain frozen to this day.

如果地球与太阳的距离再大1%，大约20亿年前地球上失控的冰期就会导致海洋冻结，并一直冻结到今天。

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After reaching about half of the Earth-Sun distance from the Sun, the comet should fade rapidly as it then heads out of the inner Solar System.

到达距太阳半个日地距离之后，彗星会因朝着内太阳系之外急速前进而快速变暗。

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To the sun, the Earth is a tiny speck: its diameter is less than 0.01% of the Earth-sun distance.

CNN: The sun, the moon and the Titanic

Now only visible with the largest ground-based telescopes or from space, 1999 RQ36 currently lies about one earth-sun distance away.

FORBES: New Observations Signal NASA Mission's Target Asteroid Is Sample-Friendly Rubble Pile

In 1989, Pluto was as close to the Sun as it gets during its long year - less than 30 astronomical units (AU), or 30 times the distance between Earth and the Sun.

BBC: Scientists plan Pluto flyby