Back to today’s briefing

Story perspectives

Colossal Comet Bernardinelli-Bernstein Awakens Before 2031 Approach

6/25/2025

50 5

Summary

Story summary

A colossal comet, C/2014 UN271 (Bernardinelli-Bernstein), measuring an astounding 137 kilometers wide, is stirring with molecular activity as it nears the inner Solar System. The ALMA telescope has captured jets of carbon monoxide, revealing the first direct signs of outgassing from this distant wanderer. Mark your calendars for January 29, 2031, when it will make its closest approach to the Sun!

1 of 1

Story summary

A colossal comet, C/2014 UN271 (Bernardinelli-Bernstein), measuring an astounding 137 kilometers wide, is stirring with molecular activity as it nears the inner Solar System. The ALMA telescope has captured jets of carbon monoxide, revealing the first direct signs of outgassing from this distant wanderer. Mark your calendars for January 29, 2031, when it will make its closest approach to the Sun!