A light year is the distance light can travel in one year. Light travels at a speed of around 2.99*108 m/s. Multiplying that by the number of seconds in 12 years gives you 1.135*1017m.
14,191,095,710,000,000,000 (rounded to the nearest 10 billion meters)
1 light minute (in vacuum) = 17,987,547,480 meters (easier just to remember "about 18 billion")
9.461 x 1021 (rounded to the nearest billion billion meters)
Twelve.
It equals 12,000 meters
3.9 billion of them.
1 billion feet = 189,393.94 miles.
12,000 millimeters.
There are nine zeros in a billion (1,000,000,000) and twelve zeros in a trillion (1,000,000,000,000).
To convert meters to nanometers, multiply by a billion.
312three hundred twelve
1 billion