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托福听力练习-科学美国人60秒:发现新天体

2017-04-26 10:59:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：发现新天体

　　科学美国人60秒听力练习：发现新天体

　　科学美国人60秒英文文本

　　In 1930 astronomer Clyde Tombaugh discovered the dwarf planet Pluto while looking at photographs of the night sky. Pluto was the first object to be found in what’s now known as the Kuiper Belt, a region that’s also full of asteroids. NASA’s New Horizons spacecraft intends to visit one or two of them after it flies past Pluto in 2015. But which ones?

　　That’s where you come in. Because astronomers are calling on citizen scientists to eyeball images that will help them find the outermost icy bodies in Pluto’s neighborhood. The project is described at the Web site icehunters.org

　　Some of the largest telescopes on Earth have helped produce millions of images of the relevant region of space. By comparing photos taken at different times, scientists can subtract out objects that appear stationary, like far-off galaxies, and focus on things that appear to be moving in orbits, like asteroids.

　　Now, these pictures can be a bit messy. So scientists say they could use plenty of eyes to help scan the pics for things that move—the same way Tombaugh first found Pluto. The winning object could become the most distant ever visited by a spacecraft from Earth. But you don’t even have to get off the couch.

　　—Karen Hopkin

　　中文翻译请点击下一页

本文关键字: 托福听力 科学美国人60秒

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