Is an astronomical unit is larger than a light-year? Astronomy Introduction to Astronomy Astronomy Basics 1 Answer George C. Mar 14, 2018 No, there are about 63000 astronomical units in a light year. Explanation: An astronomical unit - the average distance between the Earth and the Sun - is approximately 500 light seconds. There are 86400 seconds in a day and approximately 365.25 days in a year, Hence the number of astronomical units in one light year is approximately: (365.25 * 86400)/500 ~~ 63000 Answer link Related questions Why do astronomers use scientific notation to describe sizes? What is astronomy? What types of jobs are available for those who hold a degree in astronomy? What is the meaning of the word astronomy? How would you calculate the energy of a photon with a known frequency? What is the difference between astronomy and astrology? What schools are renowned for their astronomy programs? What is a meteor? What occupations are there in the astronomy field? How is the acceleration of gravity calculated for planets? See all questions in Astronomy Basics Impact of this question 13632 views around the world You can reuse this answer Creative Commons License