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  1. science.nasa.gov › exoplanets › what-is-a-light-yearWhat is a light-year? - NASA Science

    Light-year is the distance light travels in one year. Light zips through interstellar space at 186,000 miles (300,000 kilometers) per second and 5.88 trillion miles (9.46 trillion kilometers) per year. We use light-time to measure the vast distances of space.

  2. en.wikipedia.org › wiki › Light-yearLight-year - Wikipedia

    A light-year, alternatively spelled light year (ly), is a unit of length used to express astronomical distances and is equal to exactly 9,460,730,472,580.8 km (Scientific notation: 9.4607304725808 × 10 12 km), which is approximately 5.88 trillion mi.

  3. www.space.com › light-yearWhat is a light-year? | Space

    22 gru 2021 · A light-year is a measure of astronomical distance: Light travels through a vacuum at precisely 983,571,056 feet (299,792,458 meters) per second, making a light-year approximately 6...

  4. spaceplace.nasa.gov › light-year › "What Is a Light-Year? | NASA Space Place – NASA Science for Kids

    9 lip 2024 · A light-year is the distance light travels in one Earth year. Learn about how we use light-years to measure the distance of objects in space.

  5. sciencenotes.org › what-is-a-light-year-definition-and-examplesWhat Is a Light Year? Definition and Examples - Science Notes and...

    28 maj 2020 · A light year (ly) is the distance light travels in one Earth year. It is 9.4607×10 15 meters or 5.8786×10 12 miles, about 63 astronomical units or about 0.3 parsecs. It is an intermediate unit of astronomical distance.

  6. earthsky.org › space › what-is-a-light-yearWhat is a light year? Find out. | Sky Archive | EarthSky

    20 lut 2013 · A light-year is how astronomers measure distance in space. It’s defined by how far a beam of light travels in one year – a distance of six trillion miles.

  7. science.nasa.gov › solar-system › cosmic-distancesCosmic Distances - NASA Science

    18 maj 2020 · A light year is the distance a photon of light travels in one year, which is about 6 trillion miles (9 trillion kilometers, or 63,000 AU). Put another way, a light year is how far you'd travel in a year if you could travel at the speed of light, which is 186,000 miles (300,000 kilometers) per second.