虽然这些元素仅仅是星际浓汤轻微的调料,但它们确实增添了汤的味道。
Signs of life
生命的迹象
So far about 180 types of these molecular ingredients have been detected in space from theirmicrowave spectrathe energy produced when molecules rotate around their chemicalbonds.
到目前为止,人们已经通过微波谱线探测出约180种分子成分。分子绕其化学键旋转时,分子能级会发生改变,从而产生微波谱线。
There are two reasons for wanting to study them.
研究微波谱线有两个原因。
One is that these molecules are probably the precursors of life.
一是分子可能是生命的预兆。
The other is that the rarefied nature of astrochemistry changes the way processes work.
二是天体化学其稀薄的属性会改变化学反应的过程。
It means the individual steps in chemical reactions can be disentangled from one another ina way that is hardand sometimes impossibleon Earth.
人们可以用这种方式把化学反应中独立的一步从彼此步骤间分离出来,有时这在地球上很难实现。
And it allows reactions to happen that are unknown on Earth.
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