Sound cannot travel through a vacuum because there is no material to carry vibrations.

The longer version

A pressure wave is a chain reaction: one particle nudges the next, and that neighbour nudges the one beyond. Remove the particles and there is nothing to nudge. In empty space a vibrating object keeps its energy or radiates it as something else, because no medium exists to be squeezed and stretched.

Fictional space battles are loud; real ones would be silent apart from what travels inside a hull. Vibrations still cross a craft through its metal frame, so anyone inside would hear impacts conducted through solid structure. The tabletop version is a bell rung inside a jar: pump the air out and the ringing fades away.

Where this entry sits

Sound and Music gathers facts about how vibrations move through air and water, how ears turn them into meaning, and how instruments and notation shape what listeners hear. Expect echoes, pitch, volume, acoustics, and the odd silence in between. The full list sits on the Sound and Music page, where every entry is listed in order.

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More From Sound and Music

Eight more entries

Sound moves faster through water than through air, and faster still through solid steel.

Thunder arrives after lightning because light travels far faster than sound through air.

An echo is simply a sound wave bouncing off a hard surface and returning to the listener.

A room with soft furnishings produces fewer echoes than an empty room with bare walls.

The human ear collects sound with a funnel of cartilage and skin called the pinna.

Tiny hair cells inside the cochlea convert vibrations into electrical signals the brain can read.

Loud sounds can damage hearing permanently by harming the delicate hair cells in the inner ear.

The eardrum is a thin membrane that vibrates when incoming pressure waves strike it.

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