Black Holes ExplainedOverviewImagine a region in space where the force of gravity is so strong that nothing—not even light—can escape. A region with physical conditions so extreme that they have not yet been reproduced in any terrestrial laboratory. A region so dense that an object as tiny as a walnut would have the same mass as our entire planet.First airedMay 1, 2009URL slugblack-holes-explainedGenres纪录片图片海报背景暂无图片图标暂无图片横幅季特别篇0 集第 1 季12 集演职人员
