Black hole

A black hole is a geometrically defined 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.

Objects whose gravitational fields are too strong for light to escape were first considered in the 18th century by John Michell and Pierre-Simon Laplace. The first modern solution of general relativity that would characterize a black hole was found by Karl Schwarzschild in 1916, although its interpretation as a region of space from which nothing can escape was first published by David Finkelstein in 1958. Black holes were long considered a mathematical curiosity; it was during the 1960s that theoretical work showed they were a generic prediction of general relativity. The discovery of neutron stars sparked interest in gravitationally collapsed compact objects as a possible astrophysical reality.

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Black hole (networking)

In networking, black holes refer to places in the network where incoming or outgoing traffic is silently discarded (or "dropped"), without informing the source that the data did not reach its intended recipient.

When examining the topology of the network, the black holes themselves are invisible, and can only be detected by monitoring the lost traffic; hence the name.

Dead addresses

The most common form of black hole is simply an IP address that specifies a host machine that is not running or an address to which no host has been assigned.

Even though TCP/IP provides means of communicating the delivery failure back to the sender via ICMP, traffic destined for such addresses is often just dropped.

Note that a dead address will be undetectable only to protocols that are both connectionless and unreliable (e.g., UDP). Connection-oriented or reliable protocols (TCP, RUDP) will either fail to connect to a dead address or will fail to receive expected acknowledgements.

Firewalls and "stealth" ports

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Black hole (disambiguation)

A black hole is an object with sufficient density that the force of gravity prevents anything from escaping from it except through quantum tunneling behavior.

Black hole may also refer to:

Computing

  • Black hole (networking), in computer networking, a place where traffic is silently discarded
  • Blackhole exploit kit, used to install malware on victims' computers
  • DNSBL (DNS-based Black Hole List), used to block spamming IP addresses; they are often called "blackhole lists"
  • Blackhole server, a DNS server that handles reverse lookups of invalid IP ranges
  • bit bucket, in computer programming, a place of permanent oblivion for data
  • Blackhole, one of the storage engines provided by MySQL databases

    • Media

  • The Black Hole, a 1979 science fiction film
  • Black Holes (film), a 1995 Italian film
  • The Black Hole (2006 film), a science fiction film
  • Black Hole (2013 film), an unreleased film
  • Black Hole (2015 film), a documentary film
  • Black Hole (comics), a series of comics by Charles Burns
  • Black Hole (Kinnikuman), a character in the manga and anime Kinnikuman
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    This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Black_hole_(disambiguation)

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    Black Hole

    by: Beck

    Windy
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    Gotta be
    Gotta be
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    Open to a wastecan
    Yellow car
    Yellow car
    Better be inside there
    Wake up
    Wake up
    Nothing's gonna harm you
    Glass wall
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    Standing on the furniture
    Little boy
    Little boy
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    Watching
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    Through the cracks of his eyelids
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    Lost him
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    Standing on the orange chairs
    Alphabet
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    Can't afford a telephone
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    Latest News for: black hole

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    The Oregonian 23 Apr 2025
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    The Oregonian 23 Apr 2025
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    Rep. Garcia returns from El Salvador with a sliver of hope for deported gay hairdresser

    The Los Angeles Times 23 Apr 2025
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    The News International 22 Apr 2025
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