You can use kilometer, but end up with fairly large numbers, which are best written in scientific notation. It is quite possible to deal with those, but perhaps due to a lack of familiarity of the general public with scientific notation, light-years and parsecs are often used instead. When using these units, you end up with smaller numbers. For example, the distance to the nearest star (after the Sun) is about 4.2 light-years; each light-year is about 9.5 x 1012 km, that is a 13-digit number if you write it out.
There are 1000 metres in 1 kilometre. Therefore, a metre is larger than a kilometre. (You use metres and kilometres to measure large distances)
Kilometres are comparable to Miles. You can measure long distances such as the distance between two cities, etc. 1 kilometre equals 0,62 miles.
No. Kilometre is a measure of distance.
Speed. Kilometre measure distance, and hour is a measure of time. Distance / Time = Speed.
to measure distances
It is possible that someday astronomers will measure all the distances of the 100 billion galaxies in the universe.
There are 1000 metres in 1 kilometre. Therefore, a metre is larger than a kilometre. (You use metres and kilometres to measure large distances)
Someday astronomers may have measured all the distances of 100 billion galaxies in the observable universe.
because it is the fastest way to measure in very long distances for example earth to other far away planets
because it is the fastest way to measure in very long distances for example earth to other far away planets
Kilometres are comparable to Miles. You can measure long distances such as the distance between two cities, etc. 1 kilometre equals 0,62 miles.
The Parsec at 3.26 lightyears ; see related link below .
exploding white dwarfs
You can't convert between the two:- millilitres is a measure of VOLUME Kilometre is a measure of LENGTH
Because, if we continued to measure the distances between star in miles, the numbers would be huge. One light-year is approximately equal to 5,865,696,000,000 miles !
The distance between places.
In order to be able to write down, remember, and discuss astronomical distances with convenient numbers. It's fundamentally the same reason why you don't tell anybody how many inches you have to walk to school or drive to work.