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1. spaceplace.nasa.gov › light-year › enWhat Is a Light-Year? - NASA Space Place

   spaceplace.nasa.gov › light-year › en

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   9 lip 2024 · For most space objects, we use light-years to describe their distance. A light-year is the distance light travels in one Earth year. One light-year is about 6 trillion miles (9 trillion km). That is a 6 with 12 zeros behind it!

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     A light-year is the distance light travels in one Earth...

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2. www.sciencecentres.org.uk › documents › 635So, what is a light year? - sciencecentres.org.uk

   www.sciencecentres.org.uk › documents › 635

   Light travels at a speed of 3 x 108 metres per second (300 000 000) in the vacuum of space (and not much slower through the air here on Earth). While it is the fastest thing in the Universe, it still takes time to travel, particularly when we are talking about the vast distances in space.

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

   sciencenotes.org › what-is-a-light-year-definition-and-examples

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   28 maj 2020 · The light year (ly) is a unit of length that is the distance light travels in a vacuum in one Earth year. One light year is approximately 9.46 trillion kilometers (9.46 x 10 12 km) or 5.88 trillion miles (5.88 x 10 12 mi).

4. www.infobooks.org › free-pdf-books › various-topics20+ Astronomy Books for Free! [PDF] - InfoBooks.org

   www.infobooks.org › free-pdf-books › various-topics

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   Our list consists of more than 20 Astronomy books in PDF format, with complete and interesting information about this science. The books are in the public domain or have been made available for free distribution.

5. sentinelmission.org › astronomical-units-measurements-glossary › light-yearLight-Year - Definition & Detailed Explanation - Astronomical...

   sentinelmission.org › astronomical-units-measurements-glossary › light-year

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   24 mar 2024 · In space exploration, the concept of a light-year is used to plan missions to distant objects in our solar system and beyond. By knowing the distance to these objects in light-years, scientists can calculate the time it would take for a spacecraft to reach its destination.

6. www.encyclopedia.com › astronomy-general › light-yearLight-year | Encyclopedia.com

   www.encyclopedia.com › astronomy-general › light-year

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   29 maj 2018 · light-year Unit of astronomical distance equal to the distance travelled in free space or a vacuum by light in one tropical year. One light-year is equal to 9.4607 × 10 12 km (5.88 × 10 12 mi).

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

   www.space.com › light-year

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   22 gru 2021 · A light-year is the distance a beam of light travels in a single Earth year, which equates to approximately 6 trillion miles (9.7 trillion kilometers). On the scale of the universe, measuring...