Astronomers at work in the control room of the Einstein Observatory X-ray astronomy satellite at the Harvard-Smithsonian Center for Astrophysics in Cambridge,Massachusetts. The pair of Einstein Observatory images on the computer screen at left are of the Crab Nebula,a supernova remnant. They show the Crab with its central pulsar (white spot) in its "on" phase (left) & its "off" phase (right). The pulsar flashes 30 times a second. The Einstein Observatory,originally designated HEAO- 2,was launched into space in 1978 | |
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