10 reasons why Pluto is not a planet

**1. Size Matters

Pluto is significantly smaller than the eight recognized planets in our solar system. Its size is comparable to some moons, leading astronomers to reclassify it.

**2. Orbital Path Crossings

Pluto’s orbit is more elliptical and inclined compared to the well-defined, flatter orbits of the traditional planets. This unique orbital path raises questions about its classification.

**3. Neighborhood of Icy Objects

Pluto shares its orbital neighborhood with other icy objects in the Kuiper Belt, a region beyond Neptune. This differs from the relatively clear orbits of the major planets.

**4. Mass Discrepancy

Pluto’s mass is considerably smaller than the collective mass of the major planets. This distinction in mass raises questions about its gravitational dominance in its orbital vicinity.

**5. Not Clearing Its Orbit

One criterion for planetary status is the ability to clear its orbit of other debris. Pluto does not fulfill this criterion due to its shared orbit with numerous other objects.

**6. Misfit in the Planet Category

Pluto’s composition and characteristics align more closely with icy objects in the Kuiper Belt than with the rocky planets in our solar system, leading to its reclassification.

**7. Dwarf Planet Designation

In 2006, the International Astronomical Union (IAU) redefined the criteria for a celestial body to be considered a planet, and Pluto did not meet these new standards. It was subsequently designated a dwarf planet.

**8. Differing Composition

Pluto’s composition, primarily composed of ice and rock, differs significantly from the gas giants and rocky planets, further justifying its classification as a dwarf planet.

**9. Limited Gravitational Influence

Due to its smaller mass, Pluto’s gravitational influence on its surroundings is limited compared to the major planets, supporting its classification as a dwarf planet.

**10. Discovery of Similar Objects

Advancements in technology led to the discovery of numerous objects in the Kuiper Belt with similar characteristics to Pluto. This discovery prompted a reconsideration of its planetary status.