BY SKYHOOK TO THE STARS For every action there is an equal and opposite reaction -- that's Newton's Third Law, an ironclad rule of physics. But when pilot-astronomer Mike Call arrived at a top-secret New England lab, he found that a brilliant re...
ON THE PLANET MERCAN THERE ARE NO STARS, NO MOON, NO OUTER SPACE .. . The citizens of Mercan cannot conceive of worlds beyond their own. Their sun, Mercaniad, is prone to deadly, radioactive flare-ups, and the Mercans have organized their life aro...