Assertion: relativity | /r/HasProperty | built upon the fact
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text: Again, I won’t pretend I can answer this question to your satisfaction in just a few minutes, but the basic answer, explained in detail in the book, is this: As we discussed earlier, relativity is built upon the fact that the speed of light is the same for everyone; that is, no matter how things are moving, everyone will always say that light is going the same speed of light — 300,000 kilometers per second (186,000 miles per second)