There are eight planets in our solar system. This count stems from the International Astronomical Union's 2006 decision to reclassify Pluto as a dwarf planet, a standard still upheld as of February 2026.

Official Definition

The IAU defines a planet as a body that orbits the Sun, is spherical due to its gravity, and clears its orbital neighborhood of other debris.

  • Mercury, Venus, Earth, and Mars form the rocky inner planets.
  • Jupiter, Saturn, Uranus, and Neptune are the outer gas and ice giants.

This leaves out Pluto and similar objects like Eris, which don't meet the third criterion.

Why Eight? A Quick History

Picture the solar system as a bustling cosmic neighborhood. Back in school, many learned nine planets, including Pluto discovered in 1930.
But as telescopes improved, astronomers spotted more Pluto-like bodies in the Kuiper Belt, prompting debate.
In 2006, the IAU voted 8-0 for eight planets to keep definitions clear amid thousands of similar objects.

Planets at a Glance

Planet| Type| Key Fact
---|---|---
Mercury| Terrestrial| Closest to Sun, no atmosphere 3
Venus| Terrestrial| Hottest planet due to greenhouse effect 4
Earth| Terrestrial| Only known life-supporting world 4
Mars| Terrestrial| Red planet with tallest volcano 3
Jupiter| Gas Giant| Largest planet, 79+ moons 4
Saturn| Gas Giant| Iconic rings of ice and rock 3
Uranus| Ice Giant| Rotates on its side 3
Neptune| Ice Giant| Farthest planet, strong winds 3

Debates and Trending Views

Some astronomers push for nine planets, citing evidence of a hypothetical "Planet Nine" lurking far beyond Neptune—possibly 10 times Earth's mass.

Forums buzz with nostalgia: "Pluto forever!" posts trend on astronomy sites, but science holds at eight.

No change as of 2026; NASA's resources confirm eight planets orbiting the Sun.

Beyond Planets

Our system boasts 400+ moons, asteroids, comets, and the Oort Cloud. Dwarf planets like Pluto (5 recognized) add intrigue without altering the count.

TL;DR: Eight planets—unchanged since 2006.

Information gathered from public forums or data available on the internet and portrayed here.