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Radio astronomy is astronomical observation at radio wavelengths.
What comes out of a radio telescope is not a picture, as we cannot picture radio waves. Changes in the intensity of radio waves are marked by changes in the voltage output of the radio astronomy receiver, which in turn converts the voltage to a digital computer number. The time and voltage are recorded in a data file by a computer. The radio astronomy project team places its data files on the Internet so that visitors can copy the actual data by going to the data files page. Visitors can also graph any of the data files right on the Web at the file graphing page using the Data Processing Software, which can be downloaded free of charge.