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SSS 2011-08-25

时间:2011-09-05 06:23来源:互联网 提供网友:gmeng   字体: [ ]
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    (单词翻译:双击或拖选)

 This is Scientific American’s 60-SecondScience. I’m John Matson, got a minute?

 
Say you need a diamond. You could go downto the jeweler, or you could put some carbon deep underground and let it sitfor a couple billion years. Or you could hop1 in a starship and cruise 4,000light years over to a dead star called pulsar J1719-1438. 
 
The pulsar is exotic on its own—it's a super-dense remnant of a star spinningat about 10,000 rpm. But far more curious is the world orbiting it, which mightbe called a planet if it weren't so strange.
 
It's about as massive as Jupiter, but much more compact. It may be the remainsof a carbon-rich white dwarf2 star. But it's been mostly cannibalized by itspulsar companion, and is now just a shadow of its former self. 
 
The object’s incredible density3 makes it subject to great internal pressure.And that pressure, acting4 on the carbon-rich makeup5 of the white dwarf, mayhave crystallized much of it to the particular form of carbon we call diamond.That's according to new research in the journal Science. The next step forastronomers is to find out if the diamond planet has rings.
 
Thanks for the minute. For Scientific American’s 60-Second Science, I’m JohnMatson.

点击收听单词发音收听单词发音  

1 hop vdJzL     
n.单脚跳,跳跃;vi.单脚跳,跳跃;着手做某事;vt.跳跃,跃过
参考例句:
  • The children had a competition to see who could hop the fastest.孩子们举行比赛,看谁单足跳跃最快。
  • How long can you hop on your right foot?你用右脚能跳多远?
2 dwarf EkjzH     
n.矮子,侏儒,矮小的动植物;vt.使…矮小
参考例句:
  • The dwarf's long arms were not proportional to his height.那侏儒的长臂与他的身高不成比例。
  • The dwarf shrugged his shoulders and shook his head. 矮子耸耸肩膀,摇摇头。
3 density rOdzZ     
n.密集,密度,浓度
参考例句:
  • The population density of that country is 685 per square mile.那个国家的人口密度为每平方英里685人。
  • The region has a very high population density.该地区的人口密度很高。
4 acting czRzoc     
n.演戏,行为,假装;adj.代理的,临时的,演出用的
参考例句:
  • Ignore her,she's just acting.别理她,她只是假装的。
  • During the seventies,her acting career was in eclipse.在七十年代,她的表演生涯黯然失色。
5 makeup 4AXxO     
n.组织;性格;化装品
参考例句:
  • Those who failed the exam take a makeup exam.这次考试不及格的人必须参加补考。
  • Do you think her beauty could makeup for her stupidity?你认为她的美丽能弥补她的愚蠢吗?
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