Converting meters to lightyears
A lightyear is a unit of distance that represents the distance light travels in one year, which is approximately 9.461 trillion kilometers or 5.879 trillion miles. To convert meters to lightyears, we need to divide the given distance in meters by 9.4607 × 10^15, the number of meters light travels in a year.
Divide meters by 9.4607 × 10^15 to get lightyears, since that is how many meters light covers in a year. A distance of 100,000,000,000 meters is about 1.057 × 10^-5 lightyears – light crosses it in 334 seconds.
Meters need a lot of zeros at this scale: Proxima Centauri, the nearest star after the Sun, is about 4.0 × 10^16 meters away, or 4.2 lightyears.
What is a meter?
The meter is the SI base unit of length and is equal to 100 centimeters or 1,000 millimeters. It was originally defined as one ten-millionth of the distance from the North Pole to the equator along the meridian through Paris. Since 1983 it has been the distance light travels in a vacuum in 1/299,792,458 of a second.
What is a lightyear?
A lightyear is a unit of measurement used in astronomy to describe vast distances in space. It represents the distance that light travels in one year, which is approximately 5.88 trillion miles or 9.46 trillion kilometers. The term "lightyear" is derived from the fact that light, which travels at a speed of about 186,282 miles per second (299,792 kilometers per second), can cover an incredible distance in the span of a year.
Light has a finite speed, so a galaxy a billion lightyears away is seen as it was a billion years ago. That is how astronomers look back at the early universe – the farther the galaxy, the older the picture.