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ScienceSurprise 3/5Difficulty 1/5Reviewed on September 17, 2026

Sound cannot travel through the vacuum of space.

Why it is true

Sound is a mechanical wave that needs a material medium, such as air, water, or metal, to propagate. In the vacuum of space, there are not enough molecules to transmit these vibrations, so silence is absolute, contrary to what many science fiction movies show.

Source: NASA

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