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How Long is a Year on Other Planets? | NASA Space Place – NASA Science for Kids
Jul 13, 2020
nasa.gov
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Light seconds, light years, light centuries: How to measure extreme distances
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How Big is a Light Year ? First of all you have to understand:- A light-year is a unit of distance, not time. 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. Think of it as the bigger, badder cousin of the inch, the mile, the kilometer, and the furlong. If you like to keep up with what’s going on in astronomy, it’s worth spending a little bit of time understanding what the deal is with this
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A light-year is a unit of measurement used in astronomy to measure the vast distances between stars and galaxies in the universe. Simply put, a light-year is the distance that light travels in a vacuum in one year. Given that the speed of light in a vacuum is constant and approximately 299,792 kilometers per second (or about 186,282 miles per second), we can calculate the distance that light travels in one year using this speed. To understand this more clearly, let's do some simple calculations:
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