The speed of light is a fundamental constant and doesn't change based on location. It is the same at sea level, on Mount Everest, or in outer space.

The speed of light in a vacuum is approximately 299,792,458 meters per second (m/s).

While the speed of light can change slightly when it travels through different mediums (like water or glass), the term you are looking for is likely "speed of light in vacuum" which is the fastest it can travel.