EM Spectrum

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Last updated 12:03 PM on 9/29/26
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7 Terms

1
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Radio waves

Longest wavelength, lowest energy; NOT blocked by Earth's atmosphere; sources include radio galaxies, quasars, pulsars, supernova remnants, the Galactic center

2
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Microwaves

NOT blocked by Earth's atmosphere; sources include the cosmic microwave background and space-probe communication

3
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Infrared

MOSTLY BLOCKED by Earth's atmosphere (only narrow windows get through); sources include star-forming regions, brown dwarfs, planets, asteroids

4
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Visible light

NOT blocked by Earth's atmosphere; sources include stars, galaxies, nebulae, planets, comets, moons

5
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Ultraviolet

BLOCKED by Earth's atmosphere; sources include hot young stars, ionized gas, star-forming regions

6
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X-rays

BLOCKED by Earth's atmosphere; sources include black holes, neutron stars, supernova remnants

7
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Gamma rays

BLOCKED by Earth's atmosphere; shortest wavelength, highest energy, most dangerous; sources include pulsars, supernova explosions, black hole jets