Science ❯ Astronomy ❯ Solar System

Trans-Neptunian Objects

Dwarf Planets Sednoids Kuiper Belt Molecular Composition 2017 OF201 2020 VN40 Oort Cloud Ammonite Methane Presence Oort Cloud Comets Orbital Dynamics Orbital Mechanics

Webb Spots Methane Gas Above Dwarf Planet Makemake

The finding leaves scientists weighing a paper-thin atmosphere versus plume outgassing, requiring higher-resolution Webb spectra.

First Trans-Neptunian Object Found in 10:1 Neptune Resonance

Discovery of 'Ammonite' Narrows Search for Planet Nine

New Distant Sednoid ‘Ammonite’ Casts Doubt on Planet Nine Hypothesis

Experimental Fusion and Solar Sail Concepts Aim to Reach Sedna in Under a Decade

Newly Cataloged Extreme Trans-Neptunian Object Challenges Planet Nine Hypothesis