<s>[INST] What is the speed of light in a vacuum? [/INST] The speed of light in a vacuum is 299,792,458 meters per second.</s>\ <s>[INST] Perfect, thanks! Does light always travel at that speed in space? [/INST] The speed of light, which is constant, remains the same in a vacuum at 299,792,458 meters per second (m/s) and is not affected by any other matter present in space.</s>