Posted by Google (99..201.63) on April 10, 2023 at 09:12:09:
In Reply to: Đời sống ngoài trái đất posted by tâm tịnh on April 10, 2023 at 08:45:02:
the speed of light = 299,792,458 meters / second
Speed of light - Wikipedia
The speed of light in vacuum, commonly denoted c, is a universal physical constant that is exactly equal to 299,792,458 metres per second (approximately 300,000 kilometres per second; 186,000 miles per second; 671 million miles per hour).[Note 3] According to the special theory of relativity, c is the upper limit for the speed at which conventional matter or energy (and thus any signal carrying information) can travel through space.[4][5][6