An interstellar visitor, comet 3I/ATLAS, was observed by ESA's Mars orbiters, providing a rare glimpse of the comet's glowing coma as it was heated by the Sun.
Between October 1 and 7, the ExoMars Trace Gas Orbiter (TGO) and Mars Express spacecraft tracked the comet's motion, with the closest approach occurring on October 3 at a distance of approximately 30 million km.
Researchers are currently studying the data to understand the comet's makeup and origins, with this event also foreshadowing future missions like the Comet Interceptor.
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Author's summary: ESA's Mars orbiters observe interstellar comet 3I/ATLAS.