Because the definition of a lightyear is: how long light can travel in a year. Hope this helped;)
a lightyear
100km is a distance, not a measurement of time. (kilometres)
Accurate measurements of time become possible after accurate measurement of length and mass because time taken by a heavy body to move a certain distance is more,and time taken by a light body to move a certain distance is less.
Measurement always deals with a distance of a line or a distance between to objects, distance between 2 points, and so on.
A minute is a measurement of time. A light minute is a measurement of distance. it's the distance light would travel in one minute. (That's about 10 million miles!)
Yes.
a mega lightyear
Lightyear isn't about time, it's distance. One lightyear is ten trillion kilometers.
A lightyear is a much larger distance.
a lightyear
A lightyear is the distance that light can travel in one year.
(a distance traveled) divided by (time to travel the distance) is known as a "speed" .
None, a furlong is a measurement of distance, and a year is a measurement of time.
Hour = measurement of time. Miles = measurement of distance.
100km is a distance, not a measurement of time. (kilometres)
Impossible to answer ! A mie is a measurement of distance - a minute is a measurement of time !
a Lightyear, around 1013 kilometres.