| Recently, quasars have been revealed as being the nuclei of active galaxies, and, their diameter is estimated to be no larger than 1 light-year. |
| On our sun-is-a-basketball scale, a light-year is approximately 1,000 miles, which puts Alpha-Centauri 4,300 miles away. |
| Our task was easy, because we were about half a light-year from the sun. |
| In the centre of rich clusters, the stars may be only one light-year apart. |
| One magnetar is only about a light-year from the black hole at the center of the Milky Way. |
| We are still one light-year distant from Alpha Centauri, the nearest of the bright stars. |
