He passed the preliminary and went on to the finals. a boxing match or other athletic contest that takes place before the main event on the program: A preliminary was fought at 8:00. a preliminary examination, as of a candidate for an academic degree.
A light year is a measure of distance, or the distance a particle of light will travel through a pure vacuum in one Earth year. This distance is approximately 5.8785 x 1012 [5.87 trillion] miles, or 9.4605 x 1012 [9.46 trillion] kilometers.n one year, light can travel about 10 trillion km. One light-year is equal to 9,500,000,000,000 kilometers. A light year is the distance covered by light in one year travelling at 186,000 miles per second.
A light year is not a speed, but a distance. It is the distance light will travel in one year. A light year is a unit of distance equal to the length a ray of light would travel in a year, nearly 6 trillion miles, not a unit of time or speed/velocity. ânoun 1.