Interstellar visitor reappears from the sun's shadow brightening seven times faster than natural comets

1 month ago 8

By STACY LIBERATORE, US SCIENCE & TECHNOLOGY EDITOR

Published: 11:53 GMT, 30 October 2025 | Updated: 11:55 GMT, 30 October 2025

The mysterious interstellar visitor 3I/ATLAS has emerged from behind the sun, now glowing in a way that has left scientists stunned. 

The object made its closest approach to the sun on Wednesday, observed by three NASA spacecraft. 

Data showed that 3I/ATLAS brightened at a rate about seven times faster than typical comets as it reached perihelion on October 29.

In other words, its light was increasing at an unusually rapid pace as it neared the sun. 

Researchers involved with the observations published the study on Wednesday, saying: 'The reason for 3I/ATLAS’s rapid brightening, which far exceeds the brightening rate of most Oort cloud comets at similar distances from the Sun, remains unclear.'  

Even more puzzling, the interstellar visitor now appears bluer, a reversal from its previously reddish hue, suggesting something beyond simple reflection is at play.

The NASA craft detected a glowing plume extending nearly 186,000 miles around the object, comparable to the carbon dioxide halo observed months earlier.

This is a developing story... More updates to come 

The object made its closest approach to the sun on Wednesday, observed by three NASA spacecraft. Data showed that 3I/ATLAS brightened at a rate about seven times faster than typical comets as it reached perihelion on October 29

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