Glossary

This page is meant to make it easier for you to understand the content of this web site. The glossary contains both astronomical and art terms.

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Light: Light is also called radiation, though when you speak of light you usually talk about the visible part of the spectrum. Link: Fusion processes and radiation.

Light year: The distance which light travels in a earthly year. The speed of light per second is 300 000 km/s, and it adds up to about 10 trillion km per year.

Local group: A galactic cluster in which both our own milky way galaxy and our neighbour the andromeda galaxy are part of.

Luminosity: Luminosity is another word for brightness, which depends on the temperature of the body that radiates the energy, and the total surface which radiates this energy.

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