Wed Dec 17 10:30:00 UTC 2025: ## Summary:
Recent images from the Gemini North telescope confirm that interstellar comet 3I/ATLAS has become brighter and greener after its close approach to the sun. This is due to the sublimation of ice and dust caused by solar radiation, creating a coma and tail. The green hue is attributed to diatomic carbon gas. 3I/ATLAS is the third interstellar object discovered, and is being closely monitored to better understand its composition and origins.
News Article:
Interstellar Comet 3I/ATLAS Lights Up With Green Glow After Solar Flyby
Mauna Kea, Hawaii – New images captured by the Gemini North telescope on Mauna Kea reveal that interstellar comet 3I/ATLAS is exhibiting increased activity and a distinct greenish hue after its close encounter with the sun in late October. The observations confirm that the comet has become brighter as solar radiation causes ice to sublimate and spew dust and gas into space.
Scientists have identified diatomic carbon (C2) as the source of the comet’s new green glow. As 3I/ATLAS approaches its closest point to Earth on December 19, this increased activity could signal further outbursts.
“The change in color is significant,” said a representative from the National Science Foundation’s NOIRLab. “It suggests that 3I/ATLAS is releasing new molecules as it heats up, providing valuable insights into its composition.”
3I/ATLAS is the third interstellar object ever discovered. Astronomers are closely monitoring the comet to learn more about its origins and the conditions in other star systems. While some have speculated about artificial origins, experts agree that 3I/ATLAS is a typical comet, albeit one from beyond our solar system. Its trajectory suggests it will never return to our neighborhood.
First Piper 