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Comet C/2014 UN271 Reveals Surprising Activity Beyond Solar System

10/18/2025

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Summary

Story summary

ALMA detected carbon monoxide jets venting from C/2014 UN271, Bernardinelli-Bernstein, over a billion miles from the Sun.
The 85-mile-wide comet shows internal activity previously thought impossible at such distance.
The approach to the inner solar system could reveal insights into the solar system's early history.
The findings suggest volatile ices can drive activity far from the Sun, challenging assumptions.
The study was published in The Astrophysical Journal Letters.

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Story summary

ALMA detected carbon monoxide jets venting from C/2014 UN271, Bernardinelli-Bernstein, over a billion miles from the Sun.
The 85-mile-wide comet shows internal activity previously thought impossible at such distance.
The approach to the inner solar system could reveal insights into the solar system's early history.
The findings suggest volatile ices can drive activity far from the Sun, challenging assumptions.
The study was published in The Astrophysical Journal Letters.