一个可能性就是外部磁场的压力强行把日球层内部的粒子压到了一起，形成了窄带。
One possibility is that pressure from this external magnetic field has forced particles just inside the heliosphere to bunch together into a ribbon.
许多天文学家认为，日球层的边界是太阳风顶层，距离太阳90亿英里(150亿公里)。
Many astronomers think that the limit of the heliosphere, known as the heliopause, is about 9 billion miles (15 billion kilometers) from the sun.
日球层就像一个盾牌，挡住了90%高能宇宙射线。 宇宙射线由高速带电粒子组成，会轰击星球并伤害生物。
The heliosphere shields the solar system from 90 percent of energetic cosmic rays — high-speed charged particles that would otherwise bombard the planets and harm life.
IBEX记录到的原子绕地球旋转，根据其自身能量不同，需要1到2年才能从日球层的边缘到达探测器的位置。
The atoms recorded by IBEX, which orbits Earth, took a year or two, depending on their energies, to reach the craft from the outer edge of the heliosphere.
IBEX记录到的原子绕地球旋转，根据其自身能量不同，需要1到2年才能从日球层的边缘到达探测器的位置。
The atoms recorded by IBEX, which orbits Earth, took a year or two, depending on their energies, to reach the craft from the outer edge of the heliosphere.
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