According to our current understanding of physics, objects with mass cannot travel at or exceed the speed of light. This is based on Einstein's theory of relativity, which has been extensively tested and verified by numerous experiments.
As an object with mass accelerates towards the speed of light, its relativistic mass increases, meaning that its mass appears to become larger the faster it moves. As the object approaches the speed of light, its relativistic mass would become infinitely large, requiring an infinite amount of energy to continue accelerating. This implies that it would take an infinite amount of energy to propel an object with mass to the speed of light, which is not feasible.
Additionally, as an object with mass accelerates, its energy increases, and at relativistic speeds, this energy is predominantly kinetic energy. According to Einstein's famous equation E=mc², the energy (E) of an object is directly related to its mass (m). As an object with mass approaches the speed of light, its energy would also become infinite, which violates the laws of physics as we currently understand them.
On the other hand, massless particles, such as photons (particles of light), always travel at the speed of light in a vacuum. Since they have no mass, they are not subject to the same limitations as objects with mass. According to the theory of relativity, photons do not experience time and do not age, as time dilation does not affect them. However, it's important to note that massless particles are inherently different from objects with mass and follow different rules and properties in physics.