

Relationship between Wavelength and Frequency

A light year is the distance that something traveling at the speed would go in one year.

The distances to very far away celestial objects such as stars and galaxies are often given in light years. The speed of light is often used in aerospace and astronomy since space is nearly a perfect vacuum. Theoretically nothing can travel at a speed exceeding the speed of light. The speed of light (symbol: c) is sometimes known as "light speed". However, this can be automatically converted to other velocity units via the pull-down menu. This constant is provided in meters per second. The Speed of Light (c) in a vacuum is 299,792,458.0 meters per second (m/s).
