Planet

The International Astronomical Union has set criteria for classifying planets, requiring them to have sufficient gravitational mass to form a round shape and clear their orbit of other objects. As a result, Pluto is no longer considered a planet, leaving our solar system with eight recognized planets.

Discuss the role of the International Astronomical Union in planetary classification.

What criteria must a celestial body meet to be classified as a planet?

What does it mean for a planet to sweep the region of its orbit free of other objects?

Explain why Pluto is no longer considered a planet.

How many planets are currently recognized in our solar system?