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2-1 Light travels through empty space at a speed of nearly 300,000 km/s
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2-2 Glowing objects, like stars, emit an entire spectrum of light
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2-3 An objectâs temperature is revealed by the most intense wavelength of its spectrum of light
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2-4 An objectâs chemical composition is revealed by the unique pattern of its spectrum of light
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2-5 An objectâs motion through space is revealed by the precise wavelength positions of its spectrum of light
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2-6 Telescopes use lenses, mirrors, and electronics to concentrate and capture incoming light for study
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