Fossils Beyond Neptune

Compare Neptune and Triton, then locate the wider outer-Solar-System question. Keep a moon’s orbital history separate from a measured formation history for a particular Kuiper Belt object.

Explore Pluto and Charon, then compare the stated spacecraft coverage with the artist globes. Which features come from close-range observations, and which would remain inaccessible for a tiny distant body?

Compare the visible and infrared observations with the orbital groups. Dynamically hot and cold describe orbits; do not turn the terms into temperatures or a unique history for one body.

Trace brightness, reflectivity assumptions and sample selection. Explain why color similarity is informative without proving an unchanged surface composition or a directly measured diameter.

Follow how repeated detections and archived positions support an orbit. Separate identifying a moving object from measuring its size or assigning a formal dwarf-planet status.

Check which observations establish motion and which conclusions depend on albedo or dynamical interpretation. Choose a follow-up measurement that would narrow one uncertainty.

Follow the reported spectral mark on Pluto and on the separate Saturnian moon Titan. A matching feature invites a comparison; it does not by itself identify the same molecule or surface process.

Separate the measured 5.11-micrometer feature from proposed chemical carriers. Name the laboratory comparison or additional spectrum you would want before calling the composition known.