Q:

# How long does it take light to reach Earth?

A:

Light from the Sun travels 93 million miles, at a speed of 186,000 miles per second, to get to Earth in about 8 minutes and 20 seconds. People on Earth see the Sun as it was 8 minutes and 20 seconds ago.

## Keep Learning

People also see stars and galaxies as they were when the light reaching the Earth was first emitted. The galaxy MACS0647-JD is 13.3 billion light-years away, so the light from it just reaching Earth now was first emitted when the universe was only 400 million years old. The Sun only formed 4.5 billion years ago, so the light from that galaxy is over twice the age of the Sun.

Sources:

## Related Questions

• A:

It takes approximately 1.54 hours, or 1 hour 32 minutes and 18.46 seconds, to travel 100 miles at a rate of 65 mph. The formula for determining time is based on the formula rate multiplied by time equals distance. The unknown element, time, is determined by dividing distance by rate.

Filed Under:
• A:

When light travels in a vacuum, its speed is 186,282 miles per second. The fastest aircraft, which is the Boeing-43 scramjet, has a speed of 7,546 miles per hour. If these two speeds are compared, the jet's speed is approximately 0.0004 percent that of light.

Filed Under:
• A:

A person on foot could walk 700 meters in less than nine minutes at a speed of 3.1 miles per hour, which is a fairly slow walking pace. At a faster pace, such as about 6 mph, a person could walk it in less than five minutes.