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This glossary covers words that you will come across on this website.

Hubble Constant

The constant which determines the relationship between the distance to a galaxy and its velocity of recession due to the expansion of the Universe. After many years in which the Hubble constant was only know to be somewhere between 50 and 100 Kms-1Mpc-1, (kilometres per second per megaparsec). Recent research favours a value towards the lower ed of this range.

Hubble’s Law

The law that governs the expansion fo the Universe. The recession velocity of a galxay is proportional to its distance away from the observer. The law was presented by E.P. Hubble in 1929.