Black holes: the great mystery of the universe

"In 2025 the celestial space "shark" NASA researchers described is a very large version of an almost unimaginably strange, yet very real, quirk of nature known as a black hole. The reason nothing can escape from them is that they possess enormous gravitational fields. A major reason public interest in black holes is that these objects are so mysterious, which makes them extremely compelling. In fact, although science knows some basic facts about them, for the most part they remain among the universe's most shadowy components. And there are far more questions than answers about them"-- Provided by publisher.