An astronomical unit (AU, au, a.u., or ua) equals 149,597,870,700 meters. There is a constant, the unit distance, of the value of one astronomical unit. It is denoted as A. Earth is about 1.00 AU from the Sun. A light-year (ly) equals 10,000,000,000,000 km, or 10¹³ km. It represents the distance that light travels in one Julian year in a vacuum.
gOB7C. 255 429 131 429 395 373 439 263 472
ile cm ma 1 km
