qua·sar (kwzär, -sär, -zr, -sr) n.
1. An extremely distant, and thus old, celestial object whose
power output is several thousand times that of our entire galaxy.
2. a starlike object that may send out
radio waves and other forms of energy; large
red shifts imply enormous recession velocities
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quas(i-stellar) + (st)ar.
The only mechanism
people could think of that would produce such
large quantities of energy seemed to be the gravitational collapse not just of a star but of the whole central region of a galaxy. This is
now known to be a quasar.