Black holes

SS 433 is one of the most exotic star systems observed.

Hyper-Luminous X-ray source 1, commonly known as HLX-1, is an intermediate-mass black hole candidate located in the galaxy ESO 243-49.

A wormhole or "Einstein-Rosen Bridge" is a hypothetical topological feature that would fundamentally be a shortcut connecting two separate points in spacetime.

V404 Cygni is a microquasar and a binary system consisting of a black hole with a mass of about 12±3 solar masses and a late G or early K companion star of mass slightly smaller than the Sun in the constellation of Cygnus.

Sagittarius A or Sgr A is a complex radio source at the center of the Milky Way.

An accretion disk is a structure (often a circumstellar disk) formed by diffused material in orbital motion around a massive central body.

Cygnus X-3 is one of the stronger binary X-ray sources in the sky.

Gravitational collapse is the contraction of an astronomical object due to the influence of its own gravity, which tends to draw matter inward toward the center of mass.

Cygnus X-1 (abbreviated Cyg X-1) is a well-known galactic X-ray source in the constellation Cygnus, and the first such source widely accepted to be a black hole.

GRO J1655-40 is a binary star consisting of an evolved F5 primary star and a massive, unseen companion, which orbit each other once every 2.

The black hole information paradox is a puzzle resulting from the combination of quantum mechanics and general relativity.

In general relativity, an event horizon is a boundary in spacetime beyond which events cannot affect an outside observer.

A stellar black hole (or stellar-mass black hole) is a black hole formed by the gravitational collapse of a massive star.

This is a list of black holes (and stars considered probable candidates) organized by size (including black holes of undetermined mass); some items in this list are galaxies or star clusters that are believed to be organized around a black hole.

Singularity (ISBN 0-9745734-4-2) is a novel by Bill DeSmedt published by Per Aspera Press on November 8, 2004.

The Innermost stable circular orbit (often called the ISCO) is the smallest orbit in which a test particle can stably orbit a massive object in general relativity.

A black star is a gravitational object composed of matter.

It was customary to represent black hole horizons via stationary solutions of field equations, i.

In Einstein's theory of general relativity, the Schwarzschild metric (also known as the Schwarzschild vacuum or Schwarzschild solution) is the solution to the Einstein field equations that describes the gravitational field outside a spherical mass, on the assumption that the electric charge of the mass, angular momentum of the mass, and universal cosmological constant are all zero.