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Letters

Galaxy clusters slide Could the general motion of galaxy clusters (“Galaxy clusters slide to the south,” SN: 10/25/08, p. 12) be evidence of rotational motion of the matter components of the universe on a scale much larger than the observable universe? Would such motion not also result in accelerating expansion of the observable universe, as […]

Science Past for February 28, 1959

WEATHER SATELLITE ORBITING — The United States has launched into orbit the first baby weather station in space. It was hurled into its earth-circling path at 10:55 a.m. Feb. 17, and its predicted lifetime is several decades. The batteries powering the radio transmitting weather information, however, have only a two-week lifetime.