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Radio Telescope
It was Einstein who made the real trouble. He announced in
1905 that there was no such thing as absolute rest. After that there
never was.
--
Steven Leacock

Spitzer, Lyman Jr. Physical Processes
In The Interstellar Medium
Wiley-Interscience Publication, 1978
Straw, Dean R Ed. The ARRL Antenna Book
The American Radio Relay League, Inc. 1999
Townes, C.H. , Schawlow, A.L. Microwave
Spectroscopy
McGraw-Hill Book Company, Inc. 1955