Text #3622420

In the early days of radio astronomy, many radio sources were detected for which no corresponding visible object was known. By 1960 several hundred such sources were listed in the Third Cambridge Catalog and astronomers were scanning the skies in search of visible counterparts to these radio sources. Their job was made difficult both by the low resolution of the radio observations (which meant that the observers did not know exactly where to look) and by the faintness of these objects at visible wavelengths.

—from Astronomy: A Beginner's Guide to the Universe (7th Edition), a book by Eric Chaisson, Steve McMillan

Active since January 14, 2017.
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Universe Races Average WPM First Race
Default (English) 7,324 81.50 January 14, 2017
Instant Death Mode 2 73.46 November 23, 2019