星际介质：即天文学家所称的恒星间的物质。
Interstellar Medium: What astronomers call all that stuff between the stars.
另一方面，要测量与最近恒星间的距离可能有些棘手了。
Measuring the distance to the nearest star, on the other hand, can be a little tricky.
现在是飞驰向星际空间，这是恒星间的空间，现在它大约离太阳14000000000公里。
It is now hurtling toward interstellar space, which is the space between stars. It is about 14 billion kilometers (9 billion miles) away from the sun.
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