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1 E18 m - Vikipedio (163 words) |
 | m — 600 lumjaroj — distanco de Tero al Betelĝuzo. |
| m — 310 lumjaroj — distanco de Tero al pulsaro PSR 1257+12. |
| m — 1 600 lumjaroj — distanco de Tero al Oriona nebulozo. |
| 1 E18 m - encyclopedia article about 1 E18 m. (1932 words) |
| m metre, or meter, is the basic unit of length in the International System of Units (SI: Système International d'Unités). |
| It is defined as the length of the path travelled by light in absolute vacuum during a time interval of 1/299,792,458 of a second. |
| Since the speed of light in a vacuum is exactly 299,792,458 m/s, one light year is exactly equal to 9,460,730,472,580,800 m. |
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