Radio Waves from Interstellar Hydrogen
The thin clouds of hydrogen in space radiate energy at a frequency of 1420 megacycles and a wavelength of 21 centimeters. Astronomers use the phenomenon to locate the clouds and to detect their motion
The thin clouds of hydrogen in space radiate energy at a frequency of 1420 megacycles and a wavelength of 21 centimeters. Astronomers use the phenomenon to locate the clouds and to detect their motion