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 …

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 …

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). …

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 …

Dec 13, 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 …

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 …

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 …

The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles. As defined by the International Astronomical Union (IAU), …

Learn how to convert miles to light years with a simple formula. Includes real examples, cosmic scale comparisons, and FAQs for astronomy fans.

May 3, 2025 · Multiply that speed by the number of seconds in a year—roughly 31.5 million—and you get the grand total: one light year equals about 9.46 trillion kilometers (or about 5.88 trillion …