MARK R. CHARTRAND served as the Executive Director of the National Space Institute—now called the National Space Society—from 1980 to 1984. He received his Ph.D. in Astronomy from Case Western Reserve University.WIL TIRION is a reknowned Dutch uranographer. He is the author of Sky Atlas 2000.0.GARY MECHLER holds a Ph.D. in Astronomy from Case Western Reserve University. He teaches at Pima Community College in Tucson, Arizona.
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