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 'T' :

Terminator : The line on an astronomical object, such as a moon or a planet, separating day and night, lit and shadowed parts.

Transit : when one astronomical object appears to move across the face of another astronomical object from an observer's point of view.

Trojan asteroids : asteroid sharing an orbit with a planet. They are said to be leading or trailing. However, Trojan usually refers to objects accompanying Jupiter.

Resources :

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