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garbageemail222 t1_j289edi wrote

Reply to comment by drummerandrew in How fast does the Milky Way spin? How far does Earth move through space in a year? by Sabre-Tooth-Monkey

Physics gets weird when talking about aligning speeds approaching the speed of light. They're not additive.

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playadefaro t1_j29kc8j wrote

This is the most mind bendy thing ever! Is it because of some reason we know or is it because, well, it is!!?!!

Also, at what speed does the non-additive-ness start?

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Harnellas t1_j29r5bc wrote

I still don't understand why .6c plus .6c cannot equal 1.2c, I only know that it can't.

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