There are "special relativity" and "general theory of relativity" in Einstein's theory of relativity.
First of all, let's explain the special relativity. There are two big pillars in the special relativity.
The 1st is "special principle of relativity."
The 2nd is "a principle with the invariable speed of light."
The special principle of relativity is a law referred to as "A natural law is similarly realized no matter it may move by what speed."
"The natural laws" said here is all laws including fall of a thing.
Even if it is moving and the phenomenon which happens when start a chemical reaction and a nuclear reaction, burn a thing, electricity is sent or power is applied has stopped, it is said that it is completely the same.
The principle with another invariable speed of light is a law said "The velocity of light does not change no matter it may move by what speed."
This says, "The speed of light is the same for anyone."
Speed of light is set to speed per second 299,792.458 km. That is, it is about 300,000 km/s (in the case of in a vacuum). This say that this speed does not change for any persons.
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