- Home
- Reference
- Education
- Directories
- Science eStore
- Job Board
- Ask The Experts
- eGreetings
- Fun
- About Us

Welcome to PhysLink.com - Your physics and astronomy online portal. Stay a while! Check out our extensive library of educational and reference materials. Also, check out our fun section!

QuestionHow many astronomical units are in a light year? Asked by: Justin Dopiriak AnswerA good approximation would be: 1 light-year = 63240 AU (astronomical units) Just for information, 1 light-year is equivalent to the distance travelled by light in 1 year moving in a vacuum. 1 light-year is about 9.4607 * 10 ^{15} metres.
1 astronomical unit (AU) is equivalent to the average radius of the Earth's orbit. 1 AU is about 1.4960 * 10 ^{11} metres.
Simple arithmetic calculation yields the answer that 1 light-year = 63240 AU to a good approximation. Answered by: Ryan Leong, Undergraduate, NUS, Singapore |

Loading

(