Planet Distances from the Sun

Data

Source: Wikipedia — Planet.

Note: What You Should Know About Planet Distances

The table above lists each planet's mean (average) orbital distance from the Sun. But distance isn't just a number — it drives everything from a planet's temperature to how long a year lasts. Here's the background knowledge worth knowing.

How planet distances work

• The distance shown is the planet's average distance from the Sun, because no planet orbits in a perfect circle. Every orbit is an ellipse, so each planet swings slightly closer (perihelion) and slightly farther (aphelion) over its year.
• Astronomers often express these distances in astronomical units (AU) — one AU equals the average Earth–Sun distance (about 150 million km). In AU, the planets run from Mercury at 0.39 to Neptune at about 30.
• In real terms, Neptune is roughly 30 times farther from the Sun than Earth. That enormous gap is why the outer solar system is freezing, dim, and slow-moving.
• Sunlight takes about 8 minutes and 20 seconds to reach Earth. The same light needs more than 4 hours to reach Neptune.
• Distance and orbital period follow Kepler's Third Law: the farther a planet sits, the longer its year. Neptune takes almost 165 Earth years to complete one orbit — it hasn't finished a full lap since it was discovered in 1846.

Tips for reading the chart

• The distances jump dramatically past Mars. The four inner planets (Mercury to Mars) fit inside roughly 228 million km, while a single gap between Mars and Jupiter is more than that.
• Mercury is the closest, yet not the hottest planet. Venus, farther out, holds the crown for heat because of its crushing carbon-dioxide greenhouse atmosphere.
• When comparing scales, remember the distances don't reflect planet sizes — the Sun would still swallow all of them easily if you placed them together.
• Mean distance is the right number for describing a planet's orbit, but actual spacecraft travel time is longer, since probes follow curved transfer paths rather than a straight line.

Fun facts about solar-system distances

• If the Sun were a basketball, Pluto would orbit more than 2 km away at the same scale.
• Had Mercury's orbit been only a few percent smaller, tidal forces might have torn it apart entirely.
• Uranus and Neptune are so far out that daytime there is no brighter than twilight on Earth.
• The Kuiper Belt — home of Pluto and countless icy worlds — begins around 30 AU, right where Neptune's orbit ends.
• The Voyager 1 probe has now travelled more than 150 AU from the Sun, yet even it took over 40 years just to cross the outer solar system.
• The distance gap between planets isn't random — it's a rough echo of how orbital resonances and the early solar system's formation shaped the neighbourhood.

So the next time you look "how far is each planet," remember: small numbers up close hide some of the harshest environments, and the biggest distances hide the most mysterious worlds.