In the language of everyday life often use time as a meter distances, indicating the length of a path (eg, "half an hour by car", "a day trip", "10 minute walk" ). Technically, however, expressions such as "a light-year" do not express an interval of time, but a distance. An important unit of time in theoretical physics is the time to Planck.In physics, Planck units are physical units proposed by the German Nobel laureate Max Planck. Constitute a system of units naturali.Le Planck units are often described by the physicists as the "unity of God." They eliminate the fact anthropocentric arbitrariness of the system of units: some physicists believe that any extraterrestrial intelligence could make use of the same system.