Comet 3I/ATLAS, the third known visitor from beyond our Solar System, has been brightening rapidly as it approaches perihelion, its closest point to the Sun.
Due to its position behind the Sun, ground-based observations have been nearly impossible, prompting astronomers to use space-based observatories, including solar-monitoring satellites.
Researchers Qicheng Zhang and Karl Battams used these satellites to capture the comet's transformation, revealing a surprising blue shine.
Related: Strange Green Glow From Interstellar Comet 3I/ATLAS Has Scientists Puzzled
Astronomers are surprised by the comet's rapid brightening and unusual color.
Author's summary: Comet 3I/ATLAS shines blue surprisingly.