原文已被隐藏，你可用 快捷键 - 或点击 显示原文 按钮来查看原文
第1段
1 .This is Scientific American's 60-Second Space, I'm John Matson. Got a minute?
该句暂无译文！
2 .Back in 1958, at the dawn of the space age, physicist James Van Allen discovered that the Earth is ringed by high-energy charged particles.
该句暂无译文！
3 .Held in place by the planet's magnetic field, these bands of radiation were named the inner and outer Van Allen Belts.
该句暂无译文！
4 .They're of particular interest to NASA as they pose a potential danger to spacecraft.
该句暂无译文！
5 .Now a NASA mission also named for Van Allen has found something new about his belts.
该句暂无译文！
6 .By looping through them repeatedly, the twin Van Allen Probes discovered a third band of radiation.
该句暂无译文！
7 .Or at least there were three.
该句暂无译文！
8 .The two spacecraft uncovered the previously unknown structure in September.
该句暂无译文！
9 .It consisted of fast-moving electrons, situated between the two previously known Van Allen belts.
该句暂无译文！
10 .The discovery was reported in the journal Science.
该句暂无译文！
11 .But the new structure is no longer.
该句暂无译文！
12 .Four weeks after the probes found it, the third ring was wiped out by a strong shock wave emanating from the sun.
该句暂无译文！
13 .Still, the unexpected finding shows that the Van Allen belts are more complex and variable than had been assumed.
该句暂无译文！
14 .And that seemingly well-established knowledge about space still may have the capacity to surprise.
该句暂无译文！
15 .Thanks for the minute, for Scientific American's 60-Second Space. I'm John Matson.
该句暂无译文！