According to our current understanding of physics, an object with mass cannot reach or exceed the speed of light in a vacuum. This concept is based on Albert Einstein's theory of relativity.
In Einstein's theory, he derived a fundamental equation known as the mass-energy equivalence, which states that the energy (E) of an object is equal to its mass (m) times the speed of light (c) squared, expressed as E=mc². As an object with mass accelerates, its energy increases, and its relativistic mass (not its rest mass) appears to increase. As it approaches the speed of light, the amount of energy required to accelerate it further becomes infinitely large. This means that it would require an infinite amount of energy to accelerate an object with mass to the speed of light, which is not feasible.
However, it is important to note that particles without mass, such as photons (particles of light), do travel at the speed of light in a vacuum. Photons are considered massless particles, and they always travel at the speed of light in a vacuum.
So, in summary, while it is not feasible for an object with mass to reach or exceed the speed of light, massless particles like photons do indeed travel at the speed of light in a vacuum.