Theoretically, nothing can travel faster than light. The average distance from Earth to the Moon is 238,854 miles and light crosses that distance in about a second. The distance from the Sun to Earth is 92,955,817 miles and light only takes about 8 minutes to travel that distance.
Light travels in waves and can be slowed like sound, depending on the medium where it is traveling. Through the atmosphere of Earth, light moves almost as fast as it moves in a vacuum. The passing speed of light through a diamond is less than half of its vacuum speed.Learn more about Optics & Waves