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The Guardian - UK
The Guardian - UK
Lifestyle

Why does light travel at the speed it does?

Perseid meteor shower in Spain
Why doesn’t the light from all those stars arrive a bit slower or faster? Photograph: Carlos de Saa/EPA

Why does light travel at the speed it does? Is it related to the age, dimensions or oscillation of the universe? Do we know if this speed has been constant since the big bang?

Peter Lowe, Newcastle upon Tyne

• Post your answers – and new questions – below or email them to nq@theguardian.com

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