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Is it possible to detect signal from SII, Hα, OIII using radio telescope and make the similar images as optic telescope? If no, can we use the different elements to take signal? Radio telescopes, quite sensibly, observe in the radio band (or more usually the microwave band). All the emission signals you mentioned are in the optical band. SII is $671.6\:\...


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A molecular cloud is a cloud of hydrogen and other molecules in space. You may have noticed that in the atmosphere of Earth there are many clouds of dust and water vapor, and that solid objects like birds and airplanes pass thorugh those clouds with ease. Molecular clouds are dense compared to most regions of interstellar space, but they are very thin ...


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