• One argument against the comet theory is that a comet would have left a large hole in the Earth's surface.

    VOA: special.2009.01.20

  • Suppose the planet were hit by a comet-- this happened--something like this happened sixty-five million years ago, so it could happen again.

    假设这个星球被一颗彗星击中-,这样的事,大约六千五百万年前,发生过,所以它还可能再发生。

    耶鲁公开课 - 金融市场课程节选

  • Nanodiamonds are produced under only a very high temperature and high pressure event, such as a comet striking Earth.

    VOA: special.2009.01.20

  • In that event,astronomers were able to observe the icy comet long before it struck the solar system's biggest planet.

    VOA: special.2009.08.25

  • Scientists at the Goddard Space Flight Center in Greenbelt,Maryland, found the substance glycine in material brought back to Earth from a comet.

    VOA: special.2009.09.30

  • But the object that struck Jupiter in July is estimated to have been much smaller and harder to see than comet Shoemaker-Levy.

    VOA: special.2009.08.25

  • Stardust passed through a cloud of material surrounding comet Wild Two in January of two thousand four.

    VOA: special.2009.09.30

  • Since then, scientists around the world have been working to identify substances gathered from Comet Wild-Two.

    VOA: special.2009.09.30

  • A comet is a huge ball of frozen gas and dust that often releases a long trail of material as it nears the sun.

    VOA: special.2009.09.30

  • A specially designed collector gathered dust particles from the comet and stored them on the spacecraft.

    VOA: special.2009.09.30

  • On February fourteenth, Stardust will approach to within two hundred kilometers of comet Temple 1.

    VOA: special.2011.02.09

  • But it is the first time an amino acid has been discovered on a comet.

    VOA: special.2009.09.30

  • She said the discovery "supports the theory that some of life's ingredients formed in space and were delivered to Earth long ago by meteorite and comet impacts."

    VOA: special.2009.09.30

  • But scientists think it was either a comet or rock from space.

    VOA: special.2009.08.25

  • Comet Shoemaker-Levy Nine broke up and struck Jupiter.

    VOA: special.2009.08.25

  • Many scientists dismiss the comet theory.

    VOA: special.2009.01.20

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