“The first two sources of X radiation outside the house our galaxy have been uncovered in details acquired by rocket-borne X-ray detectors. The new sources have been discovered at the U.S. Naval Analysis Laboratory as coinciding with two of the most potent radio-emitting galaxies, Cygnus A and M 87. Due to the fact the earth’s environment is essentially opaque to X rays from space, devices are positioned above most of the environment by indicates of Aerobee rockets fired from the White Sands Proving Floor in New Mexico.”
—Scientific American, April 1966
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