A new model that incorporates data gathered by the JWST could help scientists understand the composition and mass of objects in the distant Kuiper Belt and beyond.

In 2004, scientists found Sedna, a potential dwarf planet beyond the belt, had a strange orbit around the sun that hinted another large mass was gravitationally pulling it. A 2014 study found a ...

A surprising chemical difference between Pluto and Sedna, another dwarf planet in the distant Kuiper Belt, is helping scientists nail down their respective masses, a new study reports.