# Backward world? Rubin finds a retrograde object past Neptune

Source: [EarthSky](https://earthsky.org/space/rubin-retrograde-object-far-solar-system-r631/) · 2026-11-08 · Space
Page: https://themorning.science/story/backward-world-rubin-finds-a-retrograde-object-past-neptune-249660fd750969ed
Kind: research · Impact: low

## In brief

- The Rubin Observatory in Chile has discovered a retrograde object, currently labeled R631.
- R631 orbits the Sun beyond the orbit of Neptune, at a steep inclination.
- EarthSky's report includes a simulation of the object's orbit by Tony Dunn.

## Why it matters

Discoveries of distant, steeply inclined objects help map the outer Solar System and test models of how it formed.

## Coverage

- [Backward world? Rubin finds a retrograde object past Neptune](https://earthsky.org/space/rubin-retrograde-object-far-solar-system-r631/) — EarthSky, 2026-11-08

Tags: rubin observatory, trans-neptunian objects, solar system, retrograde orbit, astronomy

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Brief generated by AI (claude-haiku-5-5) from the reporting listed under Coverage. Headlines belong to their publishers. The Morning Science – https://themorning.science