Comparison: Messenger is now producing much sharper views of polar regions than during the flybys.

信使号的这次探测与以往的探测相比，提供了关于极地地区的更清晰的图片。

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Cassini has been flying since 1997 and arrived at Saturn in 2004 after flybys of Earth, Venus and Jupiter.

卡西尼号1997年升空，在飞越了金星和木星以后于2004年抵达土星。

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Messenger has already been able to return a partial map of the planet's crater-filled surface after just a handful of flybys.

信使号在近距离探测一段时间后就能发回水星那凹凸不平表面的局部地图。

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The spacecraft had photographed less than one per cent of the surface, and the next few missions managed only flybys as well.

NEWYORKER: The Martian Chroniclers

Using radar imagery collected from nine years of Cassini flybys, researchers were able to patch together the first global topographic map of Titan, published in the July 2013 issue of Icarus.

ENGADGET