Could those experiments provide insights profound enough to justify the expense of sending people across interplanetary space?

这些实验能提供足够深刻的见解，从而将把人送到星际空间的花费合理化吗？

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Alien life, he will suggest, is almost certain to exist in many other parts of the universe: not just in planets, but perhaps in the centre of stars or even floating in interplanetary space.

他认为，外星生物，几乎肯定存在于宇宙的某个角落，不光是在行星上，还有可能存在于恒星的中心，甚至漂浮在星际空间。

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The air density in the exosphere is so low that atoms and molecules can escape from it into interplanetary space.

外逸层中空气的密度非常小，以致原子和分子都能逃逸到星际空间。

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Particles (known as meteoroids) that come from interplanetary space, on the other hand, are natural.

ECONOMIST: Orbital debris

Because there are more DA14s filling interplanetary space than YU55s, a 50-foot asteroid can be found in a smaller volume of space, on average, and thus closer to Earth, than a 150-foot one.

CNN: A meteor and asteroid: 1 in 100 million odds

Then, there is the LIFE biomodule, which we piggybacked in the Grunt mission simply to get it into interplanetary space for as long as possible, 34 months in the case of this mission.

MSN: Salvaging Science from Stricken Mars Moon Probe: A Scientist's View - Technology & science - Space - Space.com | NBC News