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

Electromagnetic Spectrum

The complete spectrum of Electromagnetic radiation for longest wavelengths to shortest wavelengths.

Radio waves (10^5) - (10^-3)
Infrared waves (10^-3) - (10^-6)
Visible Light (4 - 7 [* 10^-7])
Ultraviolet waves (10^-7) - (10^-9)
X-rays (10^-9) - (10^-11)
Gamma Rays (10^-11) - (10^-14)

Elliptical Galaxy

This is a galaxy with a smooth circular or elliptical appearance. It has no spiral arms, and little or no interstellar gas or dust. Its symbol is given as E.

Synonyms: elliptical, ellipticals