4.1 Units

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Samantha O'Neill

Thank you Jack. That's a huge help.

Mike F

Do we then have to change the units of the other variables, like v and t, to match, when using a particular equation?

Roelof Vuurboom

Obviously different units (or to be perhaps more pedantic different metrics) will give different numerical values for light's speed. However, I believe the relevant question is: Why isn't the speed of light (as observed by an observer) in space twice (or 10 times) faster - or slower - than the value currently measured (using any metric you care to specify)? Any answer is independent of the units discussion.

Roelof Vuurboom

Yes

Mark Deardorff

That is because it is really the speed of causation that we are talking about.

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