What Is a Planet? (And Why Pluto Doesn't Fit the Definition)

Astronomers define a planet as an object that orbits the sun (but not another object), is round (or nearly so) and has cleared the area around its orbit.

Bad Astronomy, “Orbit-clearing” planet definition calculated by astronomer

What Is a Planet? (And Why Pluto Doesn't Fit the Definition)

Pluto's redefinition is still controversial 15 years later

8 reasons Pluto should totally have planet status (pictures) - CNET

This Day in History: Pluto demoted to dwarf planet in 2006

Why Do People Care So Much About Pluto's Planetary Status? - The Atlantic

Is Pluto a planet? - Science! Astronomy & Space Exploration, and Others - Cloudy Nights

Will Pluto be reinstated as a planet?, The Independent

What Pluto Retrograde 2024 Means For Your Zodiac Sign