Interstellar Visitor
3I/ATLAS
Track the journey of the mysterious interstellar object as it travels through our solar system
Explore 3I/ATLASSky Observation
When Can You See 3I/ATLAS?
Get real-time visibility forecasts, sky location, and equipment recommendations for your location
Brightness Forecast
7-day magnitude predictions and visibility trends
Sky Location
Live coordinates and constellation information
Equipment Guide
Personalized recommendations based on current brightness
Latest Updates
Analysis
How Big is 3I/ATLAS? The Massive Interstellar Visitor Revealed
Discover the true size of 3I/ATLAS: at least 5 kilometers across and 10 times larger than previous interstellar visitors. Learn how scientists measured this mysterious object from another star system.
September 27, 2025
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Discovery
Did 3I/ATLAS Deploy a Scout? New Comet SWAN Arrives from Completely Different Direction
When comet SWAN C/2025 R2 was discovered in September 2025, astronomers wondered: could this be a scout released by the mysterious 3I/ATLAS? The answer reveals something even more intriguing about our cosmic neighborhood.
September 23, 2025
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Mystery
The Green Glow That Shouldn't Exist: 3I/ATLAS Defies Comet Chemistry
New images reveal 3I/ATLAS glowing green despite lacking the molecules that typically cause this phenomenon in comets. This latest mystery adds another puzzle to our enigmatic interstellar visitor.
September 21, 2025
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