The speed of light is basically what we consider the speed of “causality” – meaning AT the precise moment anything with mass hits the speed of light , it will be simultaneously at it destination, and every point in between and will not have increased its speed.
A thing reaching an acceleration equal to light speed is what happens at the event horizon at a black hole.
E =MC^2 shows that we’d need more energy than exists to propel any mass to that speed.
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