The Europa Clipper probe, Nasa, carried out unplanned observations of the interstellar comet 3I/ATLAS on November 6, 2025. The equipment was approximately 164 million kilometers from the object when it captured data using the UVS ultraviolet instrument. The privileged position allowed an aligned view between Sol and the comet, revealing details impossible to obtain from Terra or other space observatories.
The opportunity arose as Europa Clipper followed its trajectory towards the Júpiter system, where it will arrive in 2030. The Nasa team quickly identified the possibility and adjusted operations to capture the data without interfering with the main mission schedule. The record contributed valuable information about objects coming from outside Sistema Solar, expanding scientific knowledge about interstellar visitors.
🚨 INTERSTELLAR ALIEN OBJECT ALERT 🚨
⚠️Interstellar Comet 3I/ATLAS scanned by NASA😱
On Jan 9, Europa Clipper quietly aimed its ultraviolet instruments at the interstellar comet 3I/ATLAS—and the results matter more than they sound.
🔹 UV scan revealed gas & dust signatures… pic.twitter.com/BnVDsMXJqK— 3I/ATLAS updates (@Defence12543) January 9, 2026
Descoberta and characteristics of comet 3I/ATLAS
Comet 3I/ATLAS was detected on July 1, 2025 by the ATLAS telescope system on Chile. Sua hyperbolic trajectory confirmed interstellar origin soon after initial identification. The object passed through perihelion on October 29, 2025, at approximately 1.36 astronomical units from Sol, getting very close to the king star before starting to move away.
Após this closest approach, ground-based observations have become limited due to the unfavorable position relative to Sol. The comet is the third interstellar body confirmed in Sistema Solar, following a trajectory that will take it back to interstellar space in the coming years. Essa characteristic differentiates it from traditional comets, which remain trapped in the solar orbit.
Ângulo privileged observation by probe
The position of Europa Clipper allowed us to visualize the comet with Sol in the background, creating an alignment that highlighted the object’s tails clearly and separately. Esse longitudinal viewing angle is not accessible to telescopes based on Terra or in orbit close to our planet. The UVS instrument recorded spectra that revealed active gaseous composition, accurately differentiating dust and plasma structures.
The unique perspective facilitated the analysis of phenomena that remain hidden in conventional observations. The data complement records obtained by other observatories during previous phases of the comet’s passage, creating a more complete picture of the object. The unprecedented spatial vision adds significant scientific value to the pool of available information.
Dados collected by ultraviolet spectrograph
UVS identified signs of hydrogen and oxygen in the comet’s atmosphere, indicating the decomposition of water molecules due to solar radiation. The gaseous activity remained intense even after perihelion, demonstrating that the object continued to release material even as it moved away from Sol. The instrument captured emissions characteristic of ice sublimation processes, confirming the active nature of the celestial body.
- Cauda of dust following the trajectory of the cometary nucleus
- Ionic Cauda directed away from Sol by radiation pressure
- Emissões of hydrogen and oxygen in ultraviolet spectrum
- Indícios of continuous active decomposition water vapor
Composição chemistry and interstellar origin
The detected elements suggest the presence of frozen water in the comet’s nucleus, a common feature in bodies formed in distant star systems. Analysis of the spectra helps to understand formation conditions in other regions of the galaxy. Objetos interstellar cells preserve primordial material from their original stars, functioning as cosmic time capsules.
Comparações with Sistema Solar comets reveal significant chemical similarities and differences. 3I/ATLAS shows intense gaseous activity and well-defined tails, unlike the first interstellar visitor, 1I/’Oumuamua, detected in 2017 with an elongated shape and no visible cometary activity. The second, 2I/Borisov, identified in 2019, had a clear tail and a composition similar to local comets. The 3I/ATLAS data contribute to models of the evolution of cometary nuclei and expand the catalog of known interstellar materials.
Instrumentos and Europa Clipper capabilities
The UVS spectrograph was originally designed to study the atmosphere of Europa, the moon of Júpiter. Durante During the cruise phase, the instrument undergoes calibrations and operational tests that validate its functioning in deep space. The coverage of the visible light cameras remains closed until later phases of the mission, which is why only ultraviolet data was obtained from the comet.
The team took the opportunity to validate UVS performance in distant and complex observations. The results confirm the instrument’s capacity for spectroscopic analysis of faint and distant objects. Essa operational flexibility demonstrates the importance of long-duration missions that can respond to unexpected events in space.
Missão main heading towards Júpiter and its icy moon
Europa Clipper aims to investigate habitability potential on Júpiter’s moon Europa. Europa’s icy surface hides a subsurface ocean of liquid water, making it a priority target in the search for potentially habitable extraterrestrial environments. The probe will perform multiple close flybys starting in 2031, when it finally reaches the Jovian system.
Instrumentos will map ice composition and detect vapor plumes, if present on the moon. The mission seeks signs of conditions favorable to life in extraterrestrial environments, data that will help plan future explorations on the Jovian moon. Opportunistic observations like that of 3I/ATLAS complement the main scientific objectives, enriching the mission’s overall return.
