Site Glossary

Direction of the initial velocity relative to the horizontal.

Initial vertical position relative to the landing level.

Magnitude of the initial velocity.

technology that provides conditions necessary for humans to survive.

a graph showing how an object's brightness changes over time.

A telescope's ability to collect light, which increases with the area of its main lens or mirror.

The distance light travels in one year (about 9.46 trillion kilometres).

A condition that restricts the accuracy or usefulness of a model.

(LEO) an orbit relatively close to Earth's surface.

The total amount of energy a star emits each second.