First of all, there are two things that you might want to consider:

-Speed of light is a constant and moves at a constant speed regardless of the relative speed of the source it's coming from.

-According to Special Relativity, there's a phenomenon called length contraction; which states that any moving object is shortened along the direction of motion.

So as an observer, it is theoretically impossible to reach the speed of light. Imagine this; two spaceships moving along the same direction, one of them is moving close to speed of light. When they measure the speed of light at the same time, they will get similar results. However, the ship that's moving closer to the speed of light will have covered more distance than the other, but because of length contraction, the light will reach at the same destination but the time frame will be shorter for the faster ship.

I hope this explains

First of all, there are two things that you might want to consider:

-Speed of light is a constant and moves at a constant speed regardless of the relative speed of the source it's coming from.

-According to Special Relativity, there's a phenomenon called length contraction; which states that any moving object is shortened along the direction of motion.

So as an observer, it is theoretically impossible to reach the speed of light. Imagine this; two spaceships moving along the same direction, one of them is moving close to speed of light. When they measure the speed of light at the same time, they will get similar results. However, the ship that's moving closer to the speed of light will have covered more distance than the other, but because of length contraction, the light will reach at the same destination but the time frame will be shorter for the faster ship.

I hope this helps