A glossary will be what a glossary is. Now to clear the haze. Please remember that the terms are used due to their relative and appropriate meanings in each section in this website. Here are then the TRUE meanings of these words.

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Cosmological constant : Mathematical term involving a repulsive force, which Einstein introduced into his field equations in the general theory of relativity to counteract the self gravitation of the Universe.

Event horizon : The region, usually described as spherical, marking the outer boundary of a black hole, inside which the gravitational force is strong enough to prevent matter or radiation from escaping.

Hubble's constant : A ratio expressing the rate of apparent expansion of the universe, equal to the velocity at which a typical galaxy is receding from Earth divided by its distance from Earth.

Quark : Any of a group of six elementary particles having electric charges of a magnitude one-third or two-thirds that of the electron, regarded as constituents of all hadrons.

Singularity : A point in space-time at which gravitational forces cause matter to have infinite density and infinitesimal volume, and space and time to become infinitely distorted.

Wormhole : A theoretical distortion of space-time in a region of the universe that would link one location or time with another, through a path that is shorter in distance or duration than would otherwise be expected.