# Black Hole

A black hole is a region of spacetime exhibiting such strong gravitational effects that nothingâ€”including particles and electromagnetic radiation such as lightâ€”can escape from inside it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole. The boundary of the region from which no escape is possible is called the event horizon. Although crossing the event horizon has enormous effect on the fate of the object crossing it, it appears to have no locally detectable features. In many ways a black hole acts like an ideal black body, as it reflects no light. Moreover, quantum field theory in curved spacetime predicts that event horizons emit Hawking radiation, with the same spectrum as a black body of a temperature inversely proportional to its mass. This temperature is on the order of billionths of a kelvin for black holes of stellar mass, making it essentially impossible to observe.

Uses material from the Wikipedia article "Black Hole", which is released under the Creative Commons BY-SA 3.0.Astronomical object | Distance | Wiki | ||
---|---|---|---|---|

GHJ2008 3 | Black Hole | K | 26000 | |

Great Annihilator | Black Hole | 23000 | [x] | |

GRS 1739-278 | Black Hole | 27000 | ||

GRS 1758-258 | Black Hole | 16000 | ||

GU Muscae | Black Hole | K | 16500 | [x] |

KV Ursae Majoris | Black Hole | K | 6000 | [x] |

MM Velorum | Black Hole | G | 13000 | |

NOR X-1 | Black Hole | ... | ||

QZ Vulpeculae | Black Hole | K | 8800 | [x] |

V1033 Scorpii | Black Hole | F | 8000 | [x] |

V1357 Cygni | Black Hole | O | 7500 | [x] |

V1487 Aquilae | Black Hole | K | 8100 | [x] |

V2107 Ophiuchii | Black Hole | K | 27000 | |

V381 Normae | Black Hole | K | 17000 | [x] |

V406 Vulpeculae | Black Hole | G | 30000 | |

V4641 Sagittarii | Black Hole | B | 30000 | [x] |

V821 Arae | Black Hole | 27000 | [x] | |

XTE J1752-223 | Black Hole | 17000 | ||

XTE J1817-330 | Black Hole | 10000 |