To facilitate working with astronomical distances
in terms of reasonably manageable numbers.
Joseph Swan invented light bulb in 1879
The light year was not discovered. It was made up, by people who kept coming up with distances like [ 25,866,280,000,000 miles ] in their work, and soon realized that they were going to need something bigger than a mile, so they invented the light-year.
A light year.
Well, because we need to know the light year
1868
Thomas Edison invented the light bulb in 1879.
The light bulb was created in 1882 by Thomas Edison.
He invented the electric light in 1880
The flourescent light bulb was invented in 1827.
The term was invented for the Harry Potter series. I suppose that the name "nimbus" is derived from nimble - "quick and light in movement or action".The term was invented for the Harry Potter series. I suppose that the name "nimbus" is derived from nimble - "quick and light in movement or action".The term was invented for the Harry Potter series. I suppose that the name "nimbus" is derived from nimble - "quick and light in movement or action".The term was invented for the Harry Potter series. I suppose that the name "nimbus" is derived from nimble - "quick and light in movement or action".
light-year(:
When talking about the distances that separate stars and galaxies. A light years is the distance that light travels in one year.