How long does it take for light to travel a distance of one light year?
Another way of looking at it: the Astronomical Unit is a bit more than 8 light-minutes in distance. A light beam takes 8 minutes to travel the 93 million miles (150 million km) from the sun to the Earth.
Light travels at "the speed of light" which has been measured to be about 300,000 km/s (kilometers per second) or 186,000 m/s (miles per second) in empty space. Doing the math, a Light-year is 9.46 trillion km, or 5.88 trillion miles. Trillion is 10^12.
- A scientist who works with WIRED Magazine says the television show video animations indicates he moves at about 700 miles per hour at his current operating speed; kudos to the animation team. His in-universe feats include: Episode 1 - City of Heroes: Hits around 700 mph in order to counter the Weather Wizard's tornado.
- It is approximately 9 trillion kilometres (or about 6 trillion miles).[note 1] As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days). Because it includes the word year, the term light-year is sometimes misinterpreted as a
- It travels at around 36,373 mph. One light-year is 5.87849981 × 10 12 miles. (That's 5,878,499,810,000 miles, or nearly 6 trillion miles). So, it would take New Horizons 18,449 years to travel one light year.
Updated: 3rd October 2019