The speed of light in a vacuum is considered to be a fundamental constant of nature and is denoted by the symbol "c." According to our current understanding of physics, the speed of light in a vacuum is approximately 299,792,458 meters per second (or about 186,282 miles per second).
The temperature of an object, such as 0 Kelvin (which is absolute zero), does not affect the speed of light. The speed of light in a vacuum remains constant regardless of the temperature or any other conditions.