Who discovered the light year? Complete General Knowledge Question and Answer for Class 6, 7, 8, 9, 10, 11 and 12 Students CBSE Exams.

Who discovered the light year?

Danish astronomer, Olaus Roemer discovered the light year in 1676. Light travels a distance of 5, 880,000,000 miles in a year. This is called a light year. Light travels at a speed of 186, 284 miles per second. Light year is the unit used by astronomers to measure distances in outer space.

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