0 the distance that light travels in one year (about 9.5 million million kilometres)
1 the great distance that light travels in one year; about 5,880,000,000,000 miles or 9,460,000,000,000 kilometers
The year 1921 was an exceptionally light year for sickness, and many actuaries regarded it as an abnormally light year.
In a light year a ray of light travels 6 trillion miles, but we do not want to go into that.
When they come within one light year of one another, they will emit gravitational waves that will radiate further orbital energy until they merge completely.
In some cases, specialized units are used, such as the astronomer's parsec and light year or the particle physicist's barn.
It would need about 17,565 years at this speed to travel a complete light year.
This was coherent with the estimation made by astronomers in 1938, but after some additional measurement, this distance was re-estimated at 14.3 light year.
Along its longest visible dimension, it thus measures about 13 3 light year across.
This is equivalent to moving a distance of one light year every 14,700 years.
