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3i/Atlas (3IATLAS): 3I/ATLAS (or C/2025 N1) is the third confirmed interstellar object, discovered on July 1, 2025, by the ATLAS survey in Chile. It is an active comet with a ~10 km nucleus that passed through the inner solar system, with a perihelion on October 29, 2025, traveling at ~58 km/s, making it the fastest detected. Key Characteristics and Description Origin: Traced back to the Milky Way's "thick disk," suggesting it is a primordial, ancient object (potentially 3–11 billion years old). Structure: It possesses a coma (gas/dust cloud) and a tail, indicating it is an active, icy body. Hubble observations revealed a teardrop-shaped dust cocoon. Composition: Initial studies indicate the presence of water ice, complex organics, and unique emissions of nickel tetracarbonyl, setting it apart from typical solar system comets. Trajectory: It follows a hyperbolic, non-bound path with a high eccentricity of ~6, meaning it will leave our solar system and never return. Brightness & Visibility: It is the brightest interstellar object observed to date and was visible to ground-based telescopes during late 2025, with continued observation expected through 2026. Scientific Significance 3I/ATLAS offers a unique opportunity to study material from outside our solar system, providing insights into planet formation, organic chemistry in interstellar space, and potential panspermia. Unlike the rocky, inactive 1I/ʻOumuamua, 3I/ATLAS provides more data on the volatile composition of extrasolar bodies.
