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Interstellar Comet 3I/ATLAS Set for Solar Exit in 2025

10/5/2025

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Summary

Comet 3I/ATLAS Approaches

Comet 3I/ATLAS, discovered July 1, 2025, is the third confirmed interstellar object, traveling about 137,000 mph.
On a hyperbolic trajectory, it will exit the Solar System after its closest Sun approach on October 30, 2025.
National Aeronautics and Space Administration (NASA) says it is a natural comet and poses no Earth threat, with Mars observations following on October 3, 2025.

Summary

Comet 3I/ATLAS Observations

Comet 3I/ATLAS brightens to magnitude 12, but Sun glare hides it until November.
Mars Reconnaissance Orbiter and ESA's Mars Express will image coma and tail at perihelion October 30, 2025.
Jupiter Icy Moons Explorer (JUICE) will observe from November 2–25, 2025, likely capturing peak activity after solar heating.
NASA data releases are delayed due to the U.S. federal government shutdown.

History

Historical Context

Comet Hale-Bopp, discovered independently by Alan Hale and Thomas Bopp on July 23, 1995, became one of the brightest comets in history, reaching a magnitude of -1.8 in 1997. Its unprecedented visibility for 18 months captivated millions, surpassing the previous record held by the Great Comet of 1811. The excitement surrounding Hale-Bopp reflects humanity's enduring fascination with celestial events and advances in astronomical observation.

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Comet 3I/ATLAS Approaches

Comet 3I/ATLAS, discovered July 1, 2025, is the third confirmed interstellar object, traveling about 137,000 mph.
On a hyperbolic trajectory, it will exit the Solar System after its closest Sun approach on October 30, 2025.
National Aeronautics and Space Administration (NASA) says it is a natural comet and poses no Earth threat, with Mars observations following on October 3, 2025.

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