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Ancient Green Comet 3I/ATLAS Spotted During Lunar Eclipse

9/16/2025

Summary

Comet 3I/ATLAS Discovered

Comet 3I/ATLAS, discovered in July 2025, is an interstellar object from beyond our Solar System.
It glows green, likely due to diatomic carbon or unknown molecules.
Astronomers captured images of 3I/ATLAS during a total lunar eclipse on September 7, 2025, in Namibia.
Estimated to be around eight billion years old, it is one of the oldest observed objects.
Future surveys, including those by the Vera Rubin Telescope, will seek more interstellar objects.

Summary

Pfalzner's Planet Formation

Professor Susanne Pfalzner's research indicates that interstellar objects (ISOs) like 3I/ATLAS may act as seeds for giant planet formation, especially around higher-mass stars.
ISOs could address the difficulty of forming large bodies in short-lived planet-forming discs.
Pfalzner's models suggest young solar systems could capture millions of ISOs, speeding up planet formation.
These findings may clarify the scarcity of gas giants around low-mass stars and support multiple giant planet formation pathways.
Future studies will examine how effectively captured ISOs form planetary bodies in protoplanetary discs.

History

Historical Context

The discovery of interstellar object 1I/2017 U1 in 2017 marked humanity's first encounter with an object from beyond our Solar System. This 800-meter-long asteroid sparked interest from NASA and the European Space Agency, enhancing our understanding of planetary formation and the dynamics of protoplanetary discs, which are crucial for theories about gas giants and their origins.

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Comet 3I/ATLAS Discovered

Comet 3I/ATLAS, discovered in July 2025, is an interstellar object from beyond our Solar System.
It glows green, likely due to diatomic carbon or unknown molecules.
Astronomers captured images of 3I/ATLAS during a total lunar eclipse on September 7, 2025, in Namibia.
Estimated to be around eight billion years old, it is one of the oldest observed objects.
Future surveys, including those by the Vera Rubin Telescope, will seek more interstellar objects.

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