12.9 billion years

 I always forget what billion means.

one billion is 10億　1,000,000,000

one million is 100万　1,000,000

100 million is 1億　100,000,000

129億年かかるという

その星からの光が地球に届くまで

They say it takes 12.9 billion years the light from the star reaches the earth.

What a distance