The interstellar comet 3I/Atlas, detected in July 2025, drew global attention by displaying a speed of over 255,000 km/h and a hyperbolic trajectory, confirming its origin outside the Solar System. Elon Musk, founder of SpaceX, commented on the case in a recent post, questioning NASA’s silence regarding its unusual properties. The discovery occurred at the ATLAS telescope in Chile and represents the third recorded interstellar object, following ‘Oumuamua and 2I/Borisov. Scientists seek to understand why the object releases water vapor at 40 kg per second even far from the Sun.
Initial observations revealed an active coma, a cloud of gas and dust around the nucleus, with an estimated diameter between 440 meters and 5.6 km. NASA monitors the comet, which reaches perihelion on October 30, 2025, at 1.4 astronomical units from the Sun. Musk pointed out anomalies such as jets of material in the opposite direction to what is expected, a phenomenon called anticola, and chemical composition with nickel tetracarbonyl without iron, rare in natural bodies.
- Excessive speed: Exceeds 255,000 km/h, indicating interstellar entry.
- Gas release: Includes high concentrations of carbon dioxide and carbon monoxide.
- Observed changes: Color shifted from reddish to intense greenish between July and September.
These data, captured by telescopes such as Hubble and James Webb, fuel discussions about possible orbital variations every four hours, similar to corrections in artificial probes.
Hyperbolic trajectory confirms external visitor
Astronomers from the ATLAS project identified 3I/Atlas on July 1, 2025, with pre-discovery observations retroactive to June 14. The orbit not bound to solar gravity reinforces its interstellar nature, with an infinite speed of about 57 km/s. Concerns arise because the object passed 1.8 AU from Earth, without collision risk, but its proximity to Mars on October 3 allowed ESA observations.
The International Astronomical Union activated a global monitoring network until January 2026, involving observatories in India and Europe. Hubble images show a coma with hydroxyl emission, a trace of water vapor, detected by the Swift telescope in July and August. These findings differentiate 3I/Atlas from common comets, which activate closer to the Sun.
Chemical anomalies challenge traditional explanations
The inverted jet of 3I/Atlas, pointing toward the Sun, releases compounds such as nickel tetracarbonyl, produced industrially on Earth but unprecedented in comets. This composition, without iron traces, suggests chemical processes distinct from other stellar systems. James Webb observations on August 6, 2025, confirmed activity at 6.4 AU, driven by volatile ices beyond water.
Scientists noted emissions of cyanide and atomic carbon, linked to the color change to greenish. The water vapor release rate persists despite the distance of three astronomical units, where typical comets remain inert. These elements indicate that the object carries materials billions of years old, formed in distant galactic regions.
Carbon monoxide, fragile for long journeys, questions preservation models in interstellar space. Researchers highlight that such differences reflect cosmic diversity, without implying technological origins.
Expert reactions divide scientific views
Sabine Hossenfelder, theoretical physicist, described the behavior as unusual and exceptional, surpassing uncertainties of ‘Oumuamua. In a recent analysis, she questioned criteria for classifying bodies as atypical, given the extrapolation of known standards. Avi Loeb, from Harvard, calculated a one in 20,000 probability for similar trajectories, suggesting possible intelligent direction, though without direct evidence.
Other astronomers prefer natural interpretations, attributing variations to unique physical conditions in distant stars. The astrophysicist emphasized that 3I/Atlas provides data on planetary formation, with a nucleus rich in ices. Debates occur in Royal Astronomical Society forums, focusing on light spectra to identify more components.
Amateur astronomer images, such as from the Dobsonian Power channel, show a circular structure without a clear tail, captured by independent telescopes. These contributions complement official data, expanding the observation catalog.
Elon Musk demands transparency from space agencies
Elon Musk spoke out after noting the absence of high-resolution images from NASA, alleging technical issues during visibility peaks. He classified 3I/Atlas as not common, citing acceleration outside standards and rapidly expanding tail. The criticism gained traction on networks, with Musk advocating immediate disclosure for collective analysis.
SpaceX, under his leadership, adjusted satellites to track the object, integrating data into missions like Starship. Musk compared the case to ‘Oumuamua, whose initial silence generated speculation. Agencies like ESA responded with Mars Express updates, which observed the comet in October.
Global monitoring intensifies observations
The European Space Agency and UN coordinate surveillance with Mars missions, using instruments to capture infrared spectra. The Vera C. Rubin Observatory recorded coma growth since June, limiting the nucleus diameter. NASA’s TESS telescope detected early activity in May 2025, at 6.4 AU, indicating sublimation of non-aqueous ices.
Amateur astronomers release weekly records, focusing on brightness variations. The Lowell Discovery Telescope in Arizona confirmed a marginal coma on July 2. These efforts fill gaps, with over 300 global observations reported to the Minor Planet Center.
Rumors about confidential projects, such as NASA’s Shield 3, circulate, but without official confirmation. The focus remains on empirical data to map the exact composition.
Physical properties reveal cosmic age
3I/Atlas, with about 17 km in length in initial estimates, exceeds dimensions of extinction asteroids like the one that affected dinosaurs, although its path avoids impacts. Its age, over 7 billion years, makes it a relic from ancient galaxies, carrying primordial dust. Zwicky Transient Facility observations extended detections to June, refining the orbit with eccentricity of 6.1.
The coma contains high doses of carbon dioxide, resistant to interstellar radiation, and hydroxyl from water vapor, measured by Swift. Periodic route changes, every four hours, align with probe rotations but are attributed to asymmetric gas release. These traits, combined with intrinsic light in the surrounding halo, differentiate it from previous visitors, expanding studies on interstellar migration.
Scientists predict that, after perihelion, the object will gain visibility in December 2025, at 270 million km from Earth, for telescopes of at least 20 cm aperture. This window will allow final measurements before its permanent exit from the Solar System, leaving a legacy of data for exoplanet modeling.
