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The Electromagnetic Spectrum

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Radio Waves

Wavelength: > 1 mm. Common Astronomical Sources: Pulsars, Cosmic Microwave Background Radiation, Gas and Dust clouds.

Visible Light

Wavelength: 380 to 700 nm. Common Astronomical Sources: Stars, Galaxies, Nebulae.

Infrared

Wavelength: 700 nm to 1 mm. Common Astronomical Sources: Stars, Planets, Nebulae.

Microwaves

Wavelength: 1 mm to 30 cm. Common Astronomical Sources: Cosmic Microwave Background Radiation, Molecular clouds.

Gamma Rays

Wavelength: < 0.01 nm. Common Astronomical Sources: Pulsar systems, Nuclear reactions, Gamma-ray bursts.

X-rays

Wavelength: 0.01 nm to 10 nm. Common Astronomical Sources: Neutron stars, Black holes, Supernovae remnants.

Ultraviolet

Wavelength: 10 nm to 380 nm. Common Astronomical Sources: Young, hot stars; Supernovae remnants; Active Galactic Nuclei.

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