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an astronomer wants to observe a cloud of cold neutral (not ionized) hydrogen, far away from any stars. what would be an instrument that could help in this task?
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27 votes
27 votes
an astronomer wants to observe a cloud of cold neutral (not ionized) hydrogen, far away from any stars. what would be an instrument that could help in this task?

User Tito Sanz
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1 Answer

24 votes
24 votes

A radio telescope, tuned to a wavelength of about 21 centimeters.
User Homm
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