By Rachelle Dragani
Updated Mar 24, 2022

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Understanding the vastness of our solar system can be challenging. At its center lies the Sun, the star around which all eight planets orbit. While the planets may seem far removed, astronomers can calculate their exact positions and distances from the Sun in real time, using a unit of measurement that translates both distance and time: the light unit.

Calculating Light Years

A light year is the distance light travels in one year—roughly 6 trillion miles. Though the term is most commonly applied to interstellar distances, it also helps contextualize how long it takes light to traverse between celestial bodies. For example, if a galaxy is 90 million light years away, the light we see today left that galaxy 90 million years ago.

Planet Distances from the Sun

Planets are much closer to Earth than galaxies, so astronomers often express their distances from the Sun in light minutes or hours. These smaller units make it easier to grasp the true scale of our solar system.

• Mercury: ~36 million miles (0.0000061 light years) – about 3.3 light minutes from the Sun.
• Venus: ~67 million miles (0.0000114 light years) – about 6 light minutes from the Sun.
• Earth: ~93 million miles (0.0000158 light years) – about 8.3 light minutes from the Sun.
• Mars: ~141 million miles (0.0000242 light years) – about 12.7 light minutes from the Sun.
• Jupiter: ~483 million miles (0.0000823 light years) – about 43 light minutes from the Sun.
• Saturn: ~888 million miles (0.0001505 light years) – about 1.3 light hours from the Sun.
• Uranus: ~1.8 billion miles (0.0003028 light years) – about 2.7 light hours from the Sun.
• Neptune: ~2.8 billion miles (0.0004746 light years) – about 4.2 light hours from the Sun.

These figures illustrate not only how far each planet lies from the Sun, but also how long it takes light—and therefore information—to travel that distance. Understanding these distances gives us a clearer picture of the dynamic and expansive nature of our solar system.