The answer of this question is 1-800-None-Of-Your-Damn-Bussiness!!
in the oort cloud
A comet is a Small Solar System Body that orbits the Sun and, when close enough to the Sun, exhibits a visible coma (atmosphere) or a tail-both primarily from the effects of solar radiation upon the...
A comet will stay in space until its orbit brings its withing the gravity well of another body.
Comets come from three different places: 1) The Kuiper Belt 2) The Oort cloud 3) Outside the solar system.