If someone could travel at the speed of light, the distance from Earth to the Moon could be covered almost instantaneously. The average distance between Earth and the Moon is approximately 384,400 kilometers (238,900 miles). Since light travels at a speed of approximately 299,792 kilometers per second (186,282 miles per second), it would take light about 1.28 seconds to travel from the Earth to the Moon.
As for the cost of such a journey, it is challenging to provide a specific answer as it depends on the technology and energy requirements involved. However, it is safe to say that the cost would be exceptionally high. Achieving the ability to travel at the speed of light would necessitate significant advancements in physics, propulsion systems, and energy generation, which would likely require substantial investment in research, development, and infrastructure.
Additionally, the energy required to propel a spacecraft to the speed of light is currently far beyond our technological capabilities. The closer an object with mass gets to the speed of light, the more energy it would require to accelerate it further. According to our current understanding of physics, it would take an infinite amount of energy to accelerate an object with mass to the speed of light. Therefore, from our present scientific perspective, achieving such speeds is not feasible.