太阳风顶层曾被认为是处在太阳系区域和星际宇宙之间一层电磁波动极其强烈的区域。
The heliopause was expected to be a rather sharp boundary between the sun's domain and interstellar space.
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.
发射于1977年的航海家一号如今距离地球已有170亿公里，现在应该已经接近太阳风顶层，在那里从太阳发射出的等离子太阳风已经不能抑制来自星际空间的宇宙射线。
It's now 17 billion kilometers from Earth. And it should be close to the heliopause, where the plasma flowing outward from the sun no longer holds back the interstellar winds.
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