SSS 2010-11-05
时间：2019-01-08 作者：英语课 分类：Scientific American(十一)月
This is Scientific American’s 60-Second Science. I’m Steve Mirsky. Got a minute?
Five very old galaxies 1 are now known to astrophysicists, thanks to Albert Einstein. A century ago, Einstein predicted an effect called cosmic gravitational lensing. Picture a massive galaxy 2 out in space. From our vantage point, a second galaxy happens to be behind the first galaxy. That second galaxy should be hidden to us. Except that the nearer galaxy bends the light of the far galaxy coming our way. That light can sometimes become so distorted that it actually appears to ring the nearer galaxy. It’s called an Einstein ring, because he predicted that, too.
In the new study, researchers used the Herschel Space Observatory 3. The brightest spots on their sky map all turned out to be gravitationally magnified galaxies. The study is in the journal Science. The observatory is really detecting infrared 4 info, or heat, rather than visible light from the newly discovered galaxies. That radiation started coming our way when the universe was only two to four billion years old, less than a third of its current age. Researchers expect to find hundreds of new, old galaxies this way, along with new info about the early universe.
Thanks for the minute. For Scientific American’s 60-Second Science. I’m Steve Mirsky.
- Quasars are the highly energetic cores of distant galaxies. 类星体是遥远星系的极为活跃的核心体。
- We still don't know how many galaxies there are in the universe. 我们还不知道宇宙中有多少个星系。
- The earth is one of the planets in the Galaxy.地球是银河系中的星球之一。
- The company has a galaxy of talent.该公司拥有一批优秀的人才。
- Guy's house was close to the observatory.盖伊的房子离天文台很近。
- Officials from Greenwich Observatory have the clock checked twice a day.格林威治天文台的职员们每天对大钟检查两次。