Word: ngc
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Dates: during 1970-1979
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...stands for object No. 82 in the catalogue of nebulae, galaxies and clusters of stars started by the 18th century French astronomer Charles Messier. NGC 253 means object No. 253 in the New General Catalogue...
...could be used simultaneously. That technique gave him the resolving power of a huge single antenna with a diameter equal to the distance between the two antennas (up to 3,500 ft.). Then, aiming his twin instruments at two particularly powerful sources of radio energy, the galaxies M82 and NGC 253, * he quickly found what he was looking for: the characteristic signature of hydroxyl radicals, simple molecules composed of a single hydrogen and a single oxygen atom...