![](https://cosmosatyourdoorstep.com/wp-content/uploads/2024/04/20160901-speed-of-light-distances.jpg?w=1024)
In my article, “Where Are We?” I showed you just how huge astronomical distances really are. There’s a reason people say that incredible things are “astronomical!”
The image above illustrates how far Earth is from several faraway objects, including one of our nearest neighbor stars, Alpha Centauri.
But what does it mean for two objects to be 4.3 light years apart?
The light year is a unit of distance, used to measure distances that escape traditional units on Earth. It’s impossible to measure the universe in kilometers or miles; many thousands fit into one planet alone.
Even “astronomical units,” the distance between the Earth and the sun, are too small. That distance, as we saw in my last post, is barely a fraction of the distances in our solar system alone.
So, what exactly is a light-year?
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