![The light year is a measurement of distance. It is defined as the distance light travels in one year in vacuum. The speed of light in vacuum is 299792.458 kilometers per second. The light year is a measurement of distance. It is defined as the distance light travels in one year in vacuum. The speed of light in vacuum is 299792.458 kilometers per second.](https://homework.study.com/cimages/videopreview/videopreview-full/astronomical-units-light-years-definition-examples_165899.jpg)
The light year is a measurement of distance. It is defined as the distance light travels in one year in vacuum. The speed of light in vacuum is 299792.458 kilometers per second.
Earth Shaker - #AstroMeme How far is far? We often measure distances in space using astronomical units (AU) and light-years (ly) because of the superb distances. 1 Astronomical Unit (AU) - average
![Should you use light-years or parsecs for astronomical distance? - Sky & Telescope - Sky & Telescope Should you use light-years or parsecs for astronomical distance? - Sky & Telescope - Sky & Telescope](http://skyandtelescope.org/wp-content/uploads/Parallax-Illustration_341px.jpg)
Should you use light-years or parsecs for astronomical distance? - Sky & Telescope - Sky & Telescope
![relativity - Is a light year a different distance if measured from a moving object? - Physics Stack Exchange relativity - Is a light year a different distance if measured from a moving object? - Physics Stack Exchange](https://i.stack.imgur.com/KCQz4.png)
relativity - Is a light year a different distance if measured from a moving object? - Physics Stack Exchange
![How far is a light-year? Your astronomy lessons will blow your mind even more when you understand the sca… | Amazing science facts, Space facts, Space and astronomy How far is a light-year? Your astronomy lessons will blow your mind even more when you understand the sca… | Amazing science facts, Space facts, Space and astronomy](https://i.pinimg.com/originals/c3/18/ee/c318eea7259f56b32f10ddeab6be0798.gif)