In tracking the movement of such objects across the sky, a naive calculation of their speed can be derived by a simple distance divided by time calculation. Superluminal motion occurs as a special case of a more general phenomenon arising from the difference between the apparent speed of distant objects moving across the sky and their actual speed as measured at the source. Light echoes can also produce apparent superluminal motion. All of these sources are thought to contain a black hole, responsible for the ejection of mass at high velocities. Bursts of energy moving out along the relativistic jets emitted from these objects can have a proper motion that appears greater than the speed of light. In astronomy, superluminal motion is the apparently faster-than-light motion seen in some radio galaxies, BL Lac objects, quasars, blazars and recently also in some galactic sources called microquasars.
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