📌 Cited
Interstellar Object 3I/ATLAS: Evidence-Based Analysis of Its Mass, Composition, and Physical Properties
Written by: Astrophyzix Science Communication
Article Type: Peer-Reviewed Sourced, Explainer, Evidence-First
Key Takeaways
- 3I/ATLAS is the third confirmed interstellar object detected passing through the Solar System.
- Observations from JWST, Hubble, and ALMA confirm that the object displays typical cometary activity.
- Spectroscopy shows a carbon-dioxide-dominated coma with additional water, carbon monoxide, and organic molecules.
- Current models suggest a nucleus diameter likely near the kilometre scale.
- Estimated mass is likely on the order of billions of metric tons, consistent with other comet nuclei.
- Isotopic measurements indicate formation in an extremely cold protoplanetary environment billions of years ago.
Introduction
Interstellar objects are small bodies that formed around other stars before being gravitationally ejected from their original planetary systems. After drifting through interstellar space for millions or billions of years, some eventually pass through the Solar System where they can be observed by modern telescopes.