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 light-year

Translation: année-lumière

Definition: The distance travelled through a vacuum by light (or any other form of electromagnetic radiation) in one year. A light year is equivalent to 9,460,700,000,000 km, 63,240 astronomical units or 0.3066 parsecs.

Other Definition: None

Synonym: None