Missing link found between X-ray and radio pulsars

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Astronomers using ESA’s Integral and XMM-Newton space observatories have caught a fast-spinning ‘millisecond pulsar’ in a crucial evolutionary phase for the first time, as it swings between emitting pulses of X-rays and radio waves.

via ESA Space Science

http://www.esa.int/Our_Activities/Space_Science/Missing_link_found_between_X-ray_and_radio_pulsars