When an object approaches the speed of light then the he objects mass become infinite.
Einstein theory of relativity is actually fairly simple. It is based on two very simple ideas.
relativity describes the situation when.
in these cases Newtonian theory does not work.
But when the speed are much slower than light. And gravity is not too strong. At that point relativity and Newtonian theory are exactly the same.
the mass of an object becomes infinite as the object approaches the speed of light .
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