Neutral hydrogen emits radiation on a characteristic 21cm wavelength, while ionised hydrogen does not.

中性氢辐射出离子化氢所没有的特有的21厘米波长。

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IBEX has also generated the first maps of neutral hydrogen and oxygen atoms entering the solar system from interstellar space.

IBEX还产生了第一张从外部空间进入太阳系的中性氢原子和氧原子的地图。

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It was during the Dark Ages that the universe cooled enough to allow molecular hydrogen to form, filling the cosmos with a diffuse cloud of electrically-neutral gas.

早期期间宇宙冷却到足以使一种弥漫的电中性气体云充满了宇宙的分子氢形成。

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And since hydrogen is electrically neutral, it should be possible to observe gravity's tiny tug on it without the confounding effects of electrostatic attraction to other particles.

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