Glossary


Absolute Magnitude
A figure that indicates the true light output, or luminosity, of a star. It is the magnitude that the star would appear if it were placed at a standard distance, chosen as 10 parsecs (32.6 light-years)

Altitude
The angular distance of an object above the horizon, in degrees

Big Bang Theory
The explosive event that marked the origin of the Universe about 13.7 billion years ago.

Binary Star
A pair of stars linked by gravity, orbiting around their common centre of mass.

Chromosphere
A layer of gas above the Sun's visible surface, or photosphere. The cromosphere can be seen only when the brighter photosphere is blocked out.
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