As with any field of scientific study, astronomy has a long list of important terminology. So we've put together this glossary where you can check you fully understand the meaning of the common terms, as well as some of the more unusual words.

A -- B -- C -- D -- E -- F -- G -- H -- I -- J -- K -- L -- M -- N -- O -- P -- Q -- R -- S -- T -- U -- V -- W -- X -- Y -- Z

Words beginning with 'G' :

Galaxy : a collection of stars, gas and dust (and possibly dark matter) with a typical size of 10,000 to 100,000 light years in diameter. They contain billions of stars which are bound by gravity.

Gamma ray : the shortest and most energetic electromagnetic radiation with wavelength of 10-11 m.

Gibbous : when the Moon is more than half illuminated but not fully illuminated.

Resources :

To support the quizzes in each section, we've put together some extra resources to provide further information: