DR S. GULL & J. FIELDEN / SCIENCE PHOTO LIBRARY DR S. GULL & J. FIELDEN / SCIENCE PHOTO LIBRARY
Radio image of Tycho's supernova remnant (SNR), recorded at 11cm wavelength by the Cambridge Five Kilometre radio telescope. The dimmest parts are coded blue, with most intense regions coloured purple & white. The radio waves emitted by the SNR are synchrotron radiation produced by high-speed electrons whirling in a magnetic field. The SNR is an expanding shell of gas & dust produced by a supernova explosion that was observed by Danish astronomer Tycho Brahe on 11 November, 1572. It appeared as a bright flashing star, reaching a brightness peak after 4 days & then slowly fading until it became invisible some 15 months later.
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