# How Far Does Light Travel In A Second?

## How far does light travel in one billionth of a second?

The light-nanosecond was popularized as a unit of distance by Grace Hopper as the distance which a photon could travel in one billionth of a second (roughly 30 cm or one foot): “The speed of light is one foot per nanosecond.” In her speaking engagements, she was well known for passing out light-nanoseconds of wire to

## How far does light travel?

As already noted, the speed of light (expressed in meters per second) means that light travels a distance of 9,460,528,000,000 km (or 5,878,499,817,000 miles) in a single year. This distance is known as a “light year”, and is used to measure objects in the Universe that are at a considerable distances from us.

## How far does light travel in a day?

It is defined as the distance that light travels in free space in one day (or 86,400 light-seconds), and is equal to 2.590206837×10^13 m. It is just over 1.6×10^10 miles and approximately 8.5×10^13 feet.

## How far does light travel in a week?

It is defined as the distance that light travels in free space in one week (or 604,800 light-seconds), and is equal to 1.813144786×1014 m. It is just over 1×1011 miles and approximately 5.95×1014feet.