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molecules too far apart to transmit sound waves.
'''Outer space''' is the physical realm beyond the earth's atmosphere.
'''Outer space''' is the physical realm beyond the [[Earth]]'s atmosphere.
It is mostly empty and apparently boundless.
In space, sound cannot travel because there is not enough air. Space is a nearly perfect vacuum. The few stray [[molecule]]s floating about in space are much too far apart to transmit [[sound wave]]s.