Quirks question: Could an alien spacecraft hide in the asteroid belt?

You ask the question, we find the answer.
Could an alien spacecraft be hiding among these asteroids ? (NASA/JPL-Caltech)

This week's question comes from Quirks & Quarks twitter follower @RyanSauve who asked "With today's technology, could we detect a spaceship, perhaps by means of heat signature, hiding in the asteroid belt?" 

Dr. Jaymie Matthews, a professor of physics and astronomy at the University of British Columbia gave this a lot of thought, and came up with the answer: it's possible, but only if the spaceship was a big as an asteroid.

If you have a question get in touch: quirks@cbc.ca​ - Facebook - Twitter

Other listener questions we have answered: