Light-year - Wikipedia
A light-year, alternatively spelled light year (ly or lyr[3]), is a unit of length used to express astronomical distances and is equal to exactly 9 460 730 472 580.8 km, which is approximately 9.46 trillion km or …
How Far is a Light Year? | The Fastest Thing in the Universe
Light is the fastest thing in our Universe traveling through interstellar space at 186,000 miles/second (300,000 km/sec). In one year, light can travel 5.88 trillion miles (9.46 trillion km). A light year is a …
How far is a light-year? Plus, distances in space - EarthSky
Jan 1, 2025 · Light is the fastest-moving stuff in our universe. It travels at 186,000 miles per second (300,000 km/sec). So, a light-year is 5.88 trillion miles (9.46 trillion km). However, stars and nebulae...
Convert Light Years to Miles - CalculateMe.com
How many miles are in a light year? Use this easy and mobile-friendly calculator to convert between light years and miles. Just type the number of light years into the box and hit the Calculate button.
What Is a Light-Year? | NASA Space Place – NASA Science for Kids
Sep 25, 2025 · One light-year is about 6 trillion miles (9 trillion km). That is a 6 with 12 zeros behind it! When we use powerful telescopes to look at distant objects in space, we are actually looking back in …
How Long Is a Light Year? Understanding Cosmic Distances
Nov 11, 2025 · Since light moves at nearly 300,000 kilometers per second, the distance it covers in one year is enormous. By multiplying the speed of light by the number of seconds in a year—31,536,000 …
Light-year | Distance, Measurement, Time | Britannica
Oct 24, 2025 · Light-year, in astronomy, the distance traveled by light moving in a vacuum in the course of one year, at its accepted velocity of 299,792,458 metres per second (186,282 miles per second). …
Light Year Conversion Calculator - Convert to Miles, Kilometers & AU ...
Oct 26, 2025 · Convert light years to miles, kilometers, astronomical units instantly. Accurate light year converter with formulas, examples, and comprehensive guide to astronomical distances. Perfect for …
What Is Light-Years in Miles? The Astronomical Distance Explained
Jul 29, 2025 · In miles, one light-year stretches to approximately 5.88 trillion miles. That’s 5,880,000,000,000 miles! Why Use Light-Years? Because distances in space are truly gigantic, …
Astronomy & Astrophysics 101: What Is a Light-Year?
Dec 15, 2024 · A light-year is the distance light travels in one year. Light moves incredibly fast — about 186,000 miles (300,000 kilometers) per second, covering 5.88 trillion miles (9.46 trillion kilometers) …