In the grand body of the universe and even our own solar system the speed of light is incredibly slow on the cosmic scale. Why does it have this speed limit ? It is theoretically possible to go faster than light ? Or is light just the fastest thing we have observed thus far ?
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The first part of your question was answered, to address the other parts:
By current understanding of physics, nothing with (resting) mass can travel even AT the speed of light, and only photons can reach the speed of light.
There’re theories about reaching the speed of light, but they rely on loopholes around other theories, and seem to suggest making a wave in spacetime and surfing that wave, so really you’re not moving at all, you’re manipulating spacetime to move you.
Light is the speed of causality, which is how an effect follows a cause (you drop a ball is the cause, it starts falling is the effect). If something went faster than light, the cause would take place after the effect (a ball starts falling, and afterwards you drop it)
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