Number 89 (Story #2), July 22, 1992 by Phillip F. Schewe and Ben Stein THE GREAT ANNIHILATOR MAY BE A MICROQUASAR . The object 1E1740.7-2942 near the center of the Milky Way is an x-ray emitter and also the brightest source of positrons in the sky; the positrons reveal themselves through their collisions with electrons, resulting in the characteristic gamma radiation at 511 keV and hence the name Great Annihilator. A team of French astronomers, using the Very Large Array in New Mexico, has now studied the object at radio wavelengths and found that it exhibits radio-emitting jets whose behavior is synchronous with the variable gamma source. All of this suggests to the French astronomers that the core of 1E1740.7-2942 resembles a sort of mini-quasar. (Nature, 16 July 1992.)