They found deuterium at higher levels than it's found in Earth water-but at levels similar to the comets Hale-Bopp, Hyakutake and Halley.

数据显示月球水比地球水包含更多的重氢元素，并与海尔·波普彗星、百武彗星及哈雷彗星更为接近。

youdao

They found deuterium at higher levels than it's found in Earth water —but at levels similar to the comets Hale-Bopp, Hyakutake and Halley.

他们发现，同地球上的水相比，氘的含量更高——但同海尔·波普彗星、哈库塔克彗星和哈雷上的水有着相似的平。

youdao

They found deuterium at higher levels than it's found in Earth water - but at levels similar to the comets Hale-Bopp, Hyakutake and Halley.

他们发现，同地球上的水相比，氘的含量更高——但同海尔·波普彗星、哈库塔克彗星和哈雷上的水有着相似的平。

youdao

The goal of the Stardust-NExT spacecraft is to gather scientific evidence about one of the solar system's most changeable objects -- comets.

VOA: special.2011.02.09

The researchers say the report offers evidence that one or more comets were responsible for a sudden cooling period on Earth's surface.

VOA: special.2009.01.20

It says an explosion or explosions by comets could explain the disappearance of many animals and human beings who lived in North America at that time.

VOA: special.2009.01.20

This makes them up to 20 times bigger than those more familiar denizens of the deepest solar system, the comets.

ECONOMIST: Unbuckling the Kuiper belt

Those periods, though, are measurable only because they are short enough for astronomers to have seen the comets in question more than once.

ECONOMIST: Comet Ikeya-Zhang is enlivening the skies

But the samples we collected from it we believe to be exactly the same materials that went into forming the comets and the solar system four and a half billion years ago.

NPR: Stardust Set to Deliver Comet Samples