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Glossary

This glossary covers words that you will come across on this website.

Lenticular galaxy

This type of galaxy has a disk and a bulge, similiar to spiral galaxies, but with no obvious spiral arms. In Hubble's classification system they are identified as S0 galaxies.

Synonyms: Lenticular, lenticulars
Luminosity

The amount of energy a body radiates per unit time.