How cold is intergalactic space?
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intergalactic space is admittedly pretty cold, at -455°F (-270°C). But parts of the Boomerang have it beat, clocking in at -457.7°F (-272°C). That's about 2°F (1.1°C) above absolute zero, the coldest temperature possible according to the laws of physics
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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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