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 the distance that light can travel in a year, or: 186,000 miles/second * 60 seconds/minute * 60 minutes/hour * 24 hours/day * 365 days/year = 5,865,696,000,000 miles/year. A light year is 5,865,696,000,000 miles (9,460,800,000,000 kilometers). That's a long way! Using a light year as a distance measurement has another advantage -- it helps you determine age. Let's say that a star is 1 million light years away. The light from that star has traveled at the speed of light to reach us.