The sentence“Nothing in the world travels faster than light”

The sentence“Nothing in the world travels faster than light”means＿．
There is nothing more important to life than the sun.Without the sun,all living things on the earth will die.
The sunis a star.In the sky,there are thousands of stars like the sun.They are as large as the sun and as hot as the sun.At night you can see many stars,but in the day time you can onlysee one star-the sun.
The sun is much nearer to us than any other star.This is why it looks the biggest and
brightest of all the stars.The distance of the sun from the earth is as much as 150 millionKilometers.Most of the stars are thousands of light years away from the earth.
Do you know the light years?Nothing in the world travels faster than the light.It trarels 30000 kilo meter a second.And one light year means the distance that light trarels in oneyear.