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。
2
Neutralhydrogen emits radiation on a characteristic 21cm wavelength, while ionisedhydrogen does not.
中性氢辐射出离子化氢所没有的特有的21厘米波长。
3
The telescopes sift through the background cosmic radiation to find spots where it has been slightly perturbed as it passes through extremely hot gas, a hallmark characteristic of galaxy clusters.