NASA scientists are advocating for a geophysical planet definition that classifies any celestial body with sufficient gravity to become spherical as a planet, regardless of its orbital characteristics. This definition, which prioritizes geological properties over orbital dynamics, would reinstate Pluto as a planet and potentially add over 150 new planets to our solar system, including moons and distant icy bodies. The current IAU definition requires planets to clear their orbital neighborhood, which led to Pluto's demotion in 2006 because it shares the Kuiper Belt with thousands of other icy bodies.
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For nearly two decades, [music] Pluto has been officially classified as a dwarf planet. But a growing rebellion of planetary [music] scientists is fighting to reverse that decision, arguing that our current [music] definition of a world is fundamentally flawed.
In 2006, the International Astronomical [music] Union declared that a planet must clear its orbital neighborhood.
Because Pluto shares [music] the Kuiper Belt with thousands of icy bodies, it was demoted. However, [music] leading researchers now push for the geophysical planet definition.
>> [music] >> This new standard states that a planet is any celestial body with enough gravity to pull itself into a sphere, >> [music] >> regardless of its orbit.
If this definition is adopted, it would not only reinstate Pluto, but it would add over 150 new planets to our solar [music] system map. This includes moons like Earth's moon and distant worlds scattered up to 7.5 billion kilometers, or 4.6 [music] billion miles away. Pluto itself is a complex world, sitting [music] roughly 5.9 billion kilometers, or 3.7 billion miles from the sun. Despite surface temperatures [music] plunging to -232ยฐ C, or -387ยฐ [music] F, Pluto possesses towering mountains of solid water ice and vast plains of frozen nitrogen.
Scientists argue [music] that geology should define a planet, not just its location in space.
A spherical body with active [music] geology, an atmosphere, and a complex core is a world in its own right.
As we [music] send probes further into the dark, our understanding of the universe must evolve.
The fight for Pluto [music] is not just about simple nostalgia. It is about recognizing the true diversity of our [music] cosmic neighborhood.
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