How cold is an intergalactic void?
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And if you travel out far away from everything in the Universe, you can never get lower than a minimum of just 2.7 Kelvin or -270.45 Celsius. This is the temperature of the cosmic microwave background radiation, which permeates the entire Universe.
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Intergalactic gas is so tenuous that it emits no light of its own. Instead astronomers study it indirectly by observing how it selectively absorbs the light coming from faraway sources known as quasars
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