GRS1915+105: The Fastest Fireball in the Galaxy

Abstract

Our galaxy contains a remarkable "faster-than-light" object discovered only a few months ago by radio astronomers. The object, a blob of hot radio-emitting matter thrown off from gamma ray source GRS1915+105, was observed to separate from its larger parent object at an apparent speed of 1.25 times the velocity of light. The operant word here is "apparent". The faster-than-light separation speed (separation distance divided by time) is believed to be a consequence of the same relativistic illusion previously observed for radio objects ejected by quasars. We will start with some facts about quasars

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