Out of this world: 15 amazing space facts

Photos Logo Photos | Slide 1 of 15: Milky way galaxy and stars shining bright, Namibia, Africa

Space is silent

For sound waves to travel, the most essential requirement is a medium. As there is no atmosphere in space, sound cannot travel there, making it eerily silent. As a result, astronauts use radios to communicate with each other.

© Arctic-Images/Getty Images

from Out of this world: 15 amazing space facts

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