The U.S. space agency NASA detected an unusual phenomenon in October 2025, when the interstellar comet 3I/Atlas halted its trajectory for days in Mars’ orbit, about 27 million kilometers from the planet. The event, which defies known laws of physics, occurred on a hyperbolic trajectory where objects should not stop. Data collected by telescopes and Martian probes turned the comet into a natural laboratory, enabling detailed analyses. The scientific community is seeking explanations for the atypical behavior.
The comet, identified as the third interstellar object in the Solar System, showed a unique chemical composition with a high concentration of carbon dioxide and low water content. Its origin is estimated at 10 billion years, older than the Sun. The nucleus, with a diameter between 320 meters and 5.6 kilometers, is enveloped by gas and dust. After resuming movement, the comet is heading toward its perihelion, expected on October 29, 2025.
- Composition rich in carbon dioxide, unusual for comets.
- Origin in a distant stellar system, aged 10 billion years.
- No risk to Earth, with planned passage by Venus and Jupiter.
Phenomenon challenges orbital theories
The behavior of 3I/Atlas, nearly motionless relative to background stars, contradicts current orbital models. NASA ruled out instrumental errors, confirming the accuracy of the records. The pause, observed in October 2025, suggests the action of unknown forces, requiring updates to orbital simulation software.
Possible causes of immobility
Spectroscopic data indicated subtle vibrations in the comet’s nucleus during the event. One hypothesis points to interaction with magnetic fields or interstellar plasma as the cause of the halt. The presence of metallic grains on 3I/Atlas’ surface supports the theory of a temporary electromagnetic effect. Another explanation involves rare symmetrical gas microplumes, stabilizing the object. These factors suggest a more complex internal structure than known comets.
Unique chemical composition
Analysis of the 3I/Atlas coma revealed a predominance of carbon dioxide with low water content. This indicates formation in cold regions of a distant stellar system. The nucleus is covered by a thick layer of gas and dust, complicating precise measurements.
Impact on space studies
The event requires updates to celestial models to predict trajectories more accurately. Incorporating non-gravitational interactions will be essential for future calculations. The phenomenon highlights the need to investigate unknown forces in space. The comet’s pause underscores the importance of continuous observation of interstellar objects.
Comet’s next steps
After resuming its trajectory, 3I/Atlas is approaching its perihelion, expected on October 29, 2025. The comet will pass Venus in November 2025 and Jupiter in March 2026 before leaving the Solar System. Detailed observations continue, focusing on gas emissions and brightness.
Detailed records from Mars
The proximity to Mars enabled precise image and data captures, still under analysis. The event turned 3I/Atlas into a unique subject for studying rare cosmic phenomena, contributing to the understanding of ancient stellar systems.