AFOQT Practice Test

How many planets are there in our solar system?

1. 7

2. 8

3. 9

4. 10

The correct answer is: 8

The correct answer is that there are 8 planets in our solar system. This count includes Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. The classification of these celestial bodies is based on the criteria established by the International Astronomical Union (IAU). Historically, there was a ninth planet, Pluto, which was classified as a planet from its discovery in 1930 until 2006. However, in 2006, the IAU redefined the criteria for what constitutes a planet, leading to Pluto being reclassified as a "dwarf planet." This change is why the current recognized total of planets is 8. Understanding the current solar system structure helps in various scientific fields, such as astronomy, education, and planetary science, and emphasizes the importance of accurate classification in our understanding of the cosmos.