There are 8 officially recognized planets in our Solar System: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune

. This classification follows the International Astronomical Union (IAU) definition established in 2006, which requires a planet to orbit the Sun, be massive enough to be nearly round, and have cleared its orbital neighborhood. Pluto, once considered the ninth planet, was reclassified as a dwarf planet because it does not meet the third criterion

. In addition to the eight planets, there are five officially recognized dwarf planets in our Solar System: Ceres, Pluto, Haumea, Makemake, and Eris

. These dwarf planets are smaller bodies that are round but have not cleared their orbits. Beyond our Solar System, there are thousands of confirmed exoplanets orbiting other stars, and estimates suggest there could be an extraordinarily large number of planets in the entire universe, potentially on the order of 102310^{23}1023 or more

. Summary:

• Number of planets in the Solar System: 8
• Number of officially recognized dwarf planets: 5
• Estimated planets in the observable universe: on the order of 102310^{23}1023 or more

This reflects the current scientific consensus as of 2025.