Debris on the surface of Iapetus has a similar composition to material known to exist on Phoebe.

“土卫八”表面的碎片与已知存在于“菲比”上的物质的成分相似。

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The crash is expected to displace around 350 tonnes of debris, pushing a cloud up as high as 10km above the surface and casting the dust into direct sunlight for the first time in millions of years.

这次撞击预计将掀起近350多吨的碎片，形成约10公里高的烟尘团，将这些尘土数百万年来首次曝露于阳光的直接照射之下。

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The accident, which took place more than 400 miles above the earth's surface on Tuesday, has left a large cloud of debris drifting in space.

这场于周二在地球400英里的上空发生的事故，留下了大量漂浮的碎片。

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Data from the Sharad (SHAllow RADar) instrument (on Mars Reconnaissance Orbiter), document that some of these glacial-like features, which you find at Mars' mid-latitudes, have a significant volume of ice left below a surface of rock debris.

BBC: Q&A: Liquid water on Mars

These were formed when an asteroid or comet smacked into the lunar or Martian surface and threw out debris that fell into Earth's gravitational grasp.

WSJ: Russia Meteor Was Largest in More Than a Century

Since oceans cover two-thirds of the Earth's surface, it's more likely debris will hit water than land.

CNN: Don't count 'doomsday asteroid' out yet