Main Page

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

Today's featured picture

A binary black hole is a system consisting of two black holes in close orbit around each other. For many years, proving the existence of such binaries was made difficult because of the nature of black holes themselves and the limited means of detection available. However, in the event that a pair of black holes were to merge, an immense amount of energy should be given off as gravitational waves, with distinctive waveforms that can be calculated using general relativity.

This video is a computer simulation of the binary black hole system GW150914 during its final inspiral, merge and ringdown, as it would have been seen by a nearby observer. The star field behind the black holes is heavily distorted and appears to rotate and move, due to extreme gravitational lensing caused by spacetime being warped by the orbiting black holes. This event, observed by LIGO in 2015, was the first observation of a binary black hole merger, as well as the first direct detection of gravitational waves, confirming Einstein's predictions.

Video credit: Simulating eXtreme Spacetimes

Other areas of Wikipedia

  • Community portal – Bulletin board, projects, resources and activities covering a wide range of Wikipedia areas.
  • Help desk – Ask questions about using Wikipedia.
  • Local embassy – For Wikipedia-related communication in languages other than English.
  • Reference desk – Serving as virtual librarians, Wikipedia volunteers tackle your questions on a wide range of subjects.
  • Site news – Announcements, updates, articles and press releases on Wikipedia and the Wikimedia Foundation.
  • Village pump – For discussions about Wikipedia itself, including areas for technical issues and policies.

Wikipedia's sister projects

Wikipedia is hosted by the Wikimedia Foundation, a non-profit organization that also hosts a range of other projects:

Wikipedia languages