ly to Mm
92 unitsConvert Light year to Megameter (ly to Mm)
1 light year = 9460730473 megameters. Convert light years to megameters instantly, with the exact factor, the formula and a reference table of common values.
ly to Mm conversion table
| ly | Mm |
|---|---|
| 1 ly | 9460730473 Mm |
| 2 ly | 18921460950 Mm |
| 3 ly | 28382191420 Mm |
| 5 ly | 47303652360 Mm |
| 10 ly | 94607304730 Mm |
| 20 ly | 189214609500 Mm |
| 50 ly | 473036523600 Mm |
| 100 ly | 946073047300 Mm |
| 250 ly | 2.365183e+12 Mm |
| 500 ly | 4.730365e+12 Mm |
| 1000 ly | 9.460730e+12 Mm |
What is a light year?
A light year is a distance, not a time: it is how far light travels in one year, about 9.46 trillion kilometers. Light covers roughly 300,000 kilometers every second, and a year gives it a very long run.
Astronomers use light years because space is so empty. The nearest star beyond the Sun, Proxima Centauri, is about 4.2 light years away, and our galaxy is roughly 100,000 light years across. Seeing a star ten light years away means seeing light that left it ten years ago.
In writing, the light year is usually shortened to "ly". One light year is 9.460730e+15 meters, and that ratio is what every figure on this page is built from.