一个质子由三个带电的夸克通过强相互作用力结合而形成，它的半径是由电荷密度降到某一确定值的距离来确定的。
A proton contains three charged quarks bound by the strong force and its radius is defined as the distance at which the charge density drops below a certain value.
这是比你希望在太阳风中发现的多了大约三个数量级，证明反质子粒子真正被捕获并且储藏在这条带中。
That's about three orders of magnitude more than you'd expect to find in the solar wind, proving that the particles really are trapped and stored in this belt.
科学家们周三向亚原子理论的世界抛了颗重磅炸弹：可见世界的一块基石——质子——比先前人们认为得要小。
Scientists lobbed a bombshell into the world of sub-atomic theory on Wednesday by reporting that a primary building block of the visible Universe, the proton, is smaller than previously thought.
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