Astronautics Vocabulary

The Astronautics Vocabulary is a glossary of terms that pertain to the science and technology of spaceflight. This alphabetical list can be navigated by clicking on the letters A-Z displayed on this page.

Definition of Astronomical Unit (AU)

Translation: unité astronomique (UA)

Definition: The average distance between the Earth and the Sun, which is about 150 million kilometres (93 million miles). This unit of length is commonly used for measuring the distances between objects within the solar system.

Other Definition: None

Synonym: None