Question

trillions of kilometres mean? please explain​

Answer 1

A light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion km. More p recisely, one light-year is equal to 9,500,000,000,000 kilometers.

Answer 2

The distance that light travels in a vacuum in one year, equal to about 9.46 trillion km (5.88 trillion mi).

it basically is known as light year

eg

1 Light Year =

9.4607305 x 10power12 Kilometers