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Interstellar Comet 3I/ATLAS
November 8 , 2025
12 days
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- The interstellar comet 3I/ATLAS is accelerating unexpectedly as it moves away from the Sun and toward Earth.
- Observations suggest it lost significant mass during its perihelion (closest approach to the Sun), causing non-gravitational acceleration.
- Its speed increased from over 130,000 mph to around 152,000 mph.
- The acceleration cannot be fully explained by the Sun's gravity.
- Estimated mass loss is over 13% near perihelion.
- The comet is six weeks away from its closest approach to Earth.
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