According to the theory of relativity, as an object with mass accelerates towards the speed of light, its relativistic mass increases, and it requires an infinite amount of energy to reach the exact speed of light. Therefore, it is not possible for an object with mass to achieve or exceed the speed of light in space.
However, if we consider a massless particle, such as a photon, it travels at the speed of light in a vacuum. Photons do not experience mass increase or require additional energy to reach the speed of light.
So, in theory, you could get as close as you like to the speed of light in space by continuously accelerating, but you would never quite reach it. As you approach the speed of light, the amount of energy required to increase your velocity further would become astronomically large.
Additionally, it's worth noting that space itself can expand, leading to the expansion of the fabric of the universe. This expansion can cause galaxies to move away from each other faster than the speed of light, but it doesn't violate the theory of relativity because the galaxies themselves are not actually moving through space at speeds exceeding the speed of light.
In summary, while it is theoretically impossible for objects with mass to reach or exceed the speed of light, massless particles such as photons always travel at the speed of light in a vacuum.