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Selections from 2019: An Alternative to Planet Nine

From AUB to the outer confines of the solar system: A “Planet Nine”-shattering theory

Disk beyond Neptune could explain odd orbits 

A Disc of Icy Material, not Planet 9, Might Explain the Strange Movements in the Outer Solar System

University of Cambridge researchers propose alternative to Planet Nine theory

Is it Planet Nine or a massive disc?

The mythical ‘Planet Nine’ theory has sadly been re-debunked

No need for Planet Nine? Astronomers say an unseen disk of icy space rocks may explain things

Is the Elusive 'Planet Nine' Actually a Massive Ring of Debris in the Outer Solar System?

Mystery orbits in outermost reaches of solar system not caused by 'Planet Nine'

No Planet Nine? Weird Orbits of Distant Objects May Have Different Explanation

Planet Nine might not actually be a planet

Planet Nine may not exist after all — A massive disk of debris could be lurking beyond Neptune instead

Planet Nine may not exist, say scientists, after finding simpler explanation

Outer Solar System Orbits Not Likely Caused by "Planet Nine" 

Mystery orbits in outermost reaches of solar system not caused by ‘Planet Nine’, say researchers