英语听力：探索发现 2014-06-06 BBC 地平线：陨石的真相-11
时间：2014-08-26 09:00:08
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（单词翻译）
Weknew from the radar1 measurements where Golevka was within a few tens of metres.And yet it was actually 12 or 15 kilometres away from where it was predicted tobe without Yarkovsky effect. So these very precise radar observations allowedus to see the 12-kilometre displacement2 caused by the Yarkovsky effect.
Sophotons, those elementary mass-less particles of light really can create a tinyforce.
Theforce is about one ounce on Earth, say that the weight of a shot glass. That isthe force on this huge
asteroid3, the size of a football stadium. Even for me itis truly
remarkable4. It is dramatic that a force so slight can have suchdramatic changes on an individual asteroid’s orbit over millions of years.
TheYarkovsky effect is subtle. It takes many millions of years to gently nudge anasteroid out of its regular orbit. But once that orbit has been disturbed, theconsequences can be profound.
Nowit can come increasingly under the influence of the solar system’s largestplanet, Jupiter. Jupiter has a mass 300 times bigger than Earth’s, so there isa huge gravitational field. Often that works to our benefit. Stray objects canbe swept up in Jupiter’s gravity, drawing them into the planet. We’ve actuallyobserved Jupiter
acting5 as a shield in this way. This photograph, from theHubble Space Telescope, shows the fragments of a comet torn apart by Jupiter’sgravity. As the pieces were
drawn6 to the planet’s atmosphere, the impacts leftblast scars, some as big as the Earth.
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