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Changed the first paragraph to note that outer space is not just the empty part, but the realm of celestial objects as well
'''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.
It encompasses all observed and measured celestial bodies and the vacuum between them, and is 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.
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.