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Astronomers have announced the discovery of 3I/ATLAS, a third confirmed interstellar object hurtling through our Solar System at an astonishing 70 km/s (≈43 mi/s), racing from deep space on a hyperbolic trajectory and set to swing inside Mars’s orbit later this year.
This visitor, spotted by the ATLAS observatory in Chile on 1 July 2025, is likely a comet, exhibiting a faint coma and short tail—earning it the official comet designation C/2025 N1. Estimated at up to 20 km (12.4 miles) wide, it may be the largest interstellar object seen yet, though its bright coma suggests the actual nucleus could be smaller.
On a hyperbolic trajectory, 3I/ATLAS is not bound to the Sun, destined to pass Mars on 3 October 2025 at a safe distance of about 0.19 AU (≈28 million km), reach perihelion near 1.35 AU on 29 October, and likely swing closest to Earth around 19 December at roughly 1.79 AU.
This discovery provides a rare opportunity—only the third after ʻOumuamua in 2017 and 2I/Borisov in 2019—to study material from beyond our Solar System. Unlike ʻOumuamua, 3I/ATLAS closely resembles a typical comet and offers a more accessible target for study, potentially with both professional and amateur telescopes as it brightens to around magnitude 15 late in the year
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