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托福听力练习-科学美国人60秒:望远镜观测天体

2017-04-04 10:14:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：望远镜观测天体

　　科学美国人60秒听力练习：望远镜观测天体

　　科学美国人60秒英文文本

　　At two high-altitude sites, in two countries, two very different telescope projects have come online to scan the skies.

　　At Palomar Observatory in San Diego County, a new instrument on the Hale Telescope is looking for exoplanets. Called Project 1640, it’s designed to blot out the infrared light of a star, without blocking the light from anything else. That allows astronomers to directly observe exoplanets, even though the star is thousands or even millions of times brighter.

　　Most known exoplanets have been discovered by indirect means, but planetary scientists believe they can learn a lot more from direct observation.

　　Over in Namibia, meanwhile, a new telescope called HESS II is seeking out higher-energy photons. The 28-meter telescope is designed to identify very high energy gamma rays. And gamma rays, the most energetic kind of electromagnetic radiation, already pack a pretty good wallop.

　　The gamma rays HESS sees are mostly by-products of extremely violent astrophysical events such as supernovae and flaring black holes.

　　HESS and Project 1640 differ in method and motive. But for astronomers studying exoplanets or extreme astrophysics, the new projects represent two more eyes on the sky.

　　中文翻译请点击下一页

本文关键字: 托福听力 科学美国人

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