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The Electromagnetic Spectrum

The Electromagnetic Spectrum. Stars: How do we know?. use telescopes to observe and measure light from stars magnitude = brightness of a star absolute magnitude = actual brightness at a given distance apparent magnitude = brightness as seen from Earth Doppler shift analyze star spectrum

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The Electromagnetic Spectrum

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  1. The Electromagnetic Spectrum

  2. Stars: How do we know? • use telescopes to observe and measure light from stars • magnitude = brightness of a star • absolute magnitude = actual brightness at a given distance • apparent magnitude = brightness as seen from Earth • Doppler shift • analyze star spectrum • if shifted towards red, star moving away from Earth • if shifted towards blue, star moving towards Earth

  3. Doppler Shift NRAO/AUI/NSF 3

  4. Gas Spectra Neon Sodium 656 nm 434 nm 486 nm Hydrogen NRAO/AUI/NSF 4

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