Black Holes: Mysteries Of The Universe

Black Holes – Mysteries Of The Universe Full HD Documentary



A black hole is a mathematically defined region of spacetime exhibiting such a strong gravitational pull that no particle or electromagnetic radiation can escape from 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.

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  1. VennData commented on Jul 13

    I’d feel a lot better about things if someone would observe one if these things falling apart.

  2. bear_in_mind commented on Jul 14

    Barry, hope you have the New Horizons fly-by of Pluto dialed-up on your bookmarks for tomorrow and the coming weeks! The early images are looking very intriguing, indeed:

    New Horizons
    NASA’s Mission to Pluto

  3. Denis Drew commented on Jul 14

    A black hole results from a vicious circle of a gravitational pull which is able to accelerate at a high enough fraction of the speed of light to cause in increase in the mass of the object creating the gravity (whenever any object moves at a big enough fraction its mass increases) which in turn creates more gravity which in turn creates more mass, etc., ad infinitum. FWIW

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