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Planetary Formation

Orbital Dynamics Planet Nine Hypothesis Gravity Effects Kuiper Belt Objects Satellite Formation Origins of Water Saturn Collisions Bennu Protoplanetary Disk Protoplanetary Disks Gas Planets Rocky Planets Asteroid Origins Asteroid Research Planetary Structure Asteroids Outer Planets Chemical Composition of Planets Gravitational Dynamics Lunar Evolution Early Solar System Gravitational Interactions

Researchers Identify Compact 'Inner Kernel' in the Kuiper Belt at 43 AU

A preprint using automated clustering of 1,650 Kuiper belt orbits reports a cold, well-aligned grouping that requires independent confirmation.

Astronomers Confirm 2025 PN7 as Earth’s Seventh Quasi-Satellite

Study Pinpoints a Dry Proto‑Earth Within 3 Million Years, Bolstering Theia Water‑Delivery Theory

Discovery of 'Ammonite' Narrows Search for Planet Nine