Facts about light years

A light-year is how astronomers measure distance in space.

-Light can travel 300,000 kilometres in one seconds!

Light year is the distance that light travel can travel in one year.

-Light can also travel 9,00,000,000,000 kilometers.

-One light is about 10 trillion km.

-Almost 300 years ago, a Danish scientist named olaus roemer, was the fist man to estimate the distance light travels in a year - and using that he figure out the approximate speed of light!

I learn this in school a light years is how fast light can tralw in space i do not know how to spell that word