【科学60秒】一起来找小行星_英语听力练习mp3下载-科学-沪江听力酷

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【科学60秒】一起来找小行星

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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 ___1___ citizen scientists to ___2___ 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 ___3___ objects that appear ___4___, like far-off galaxies, and focus on things that appear to be moving in orbits, like asteroids.

Now, these pictures can be a bit ___5___. 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.
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