From: Einstein's Special Theory of Relativity: The Two Big Ideas That Changed Physics
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What does it mean that there is no single universal 'now' for everyone?

Special relativity shows that simultaneity depends on where you are and how fast you’re moving. This challenges the idea of a shared present moment.

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Think about how your 'now' might differ from someone moving very fast or far away.

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4 evidence blocks4 perspectives4 visualizations10 media resources8 rabbit holes
evidence
The laws of physics are the same in all inertial frames of reference.
evidence
Time dilation occurs for objects moving close to the speed of light.
evidence
The speed of light in vacuum is constant and independent of the motion of the source or the obser...
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Einstein's Special Theory of Relativity: The Two Big Ideas That Changed Physics
Evidence, perspectives, rabbit holes, and more