Black Hole

A black hole is a region of spacetime exhibiting such strong gravitational effects that nothing—including particles and electromagnetic radiation such as light—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 DistanceWiki
GHJ2008 3Black HoleK26000
Great AnnihilatorBlack Hole23000[x]
GRS 1739-278Black Hole27000
GRS 1758-258Black Hole16000
GU MuscaeBlack HoleK16500[x]
KV Ursae MajorisBlack HoleK6000[x]
MM VelorumBlack HoleG13000
NOR X-1Black Hole...
QZ VulpeculaeBlack HoleK8800[x]
V1033 ScorpiiBlack HoleF8000[x]
V1357 CygniBlack HoleO7500[x]
V1487 AquilaeBlack HoleK8100[x]
V2107 OphiuchiiBlack HoleK27000
V381 NormaeBlack HoleK17000[x]
V406 VulpeculaeBlack HoleG30000
V4641 SagittariiBlack HoleB30000[x]
V821 AraeBlack Hole27000[x]
XTE J1752-223Black Hole17000
XTE J1817-330Black Hole10000