View of the milky way, with a tree silhouette in the middle
Rights: Shingo Takei Published 10 May 2011, Updated 12 March 2019 Size: 160 KB Referencing Hub media

We can see but not hear stars in faraway galaxies. This is because light can travel through a vacuum but sound cannot (sound needs a medium).

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    Hearing sound

    Three components are needed for sound to be heard: A source – where the sound is made. A medium – something for the sound to travel through. A receiver – something to detect the sound. Source ...

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