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Comets News 13 December 2025 - 19 December 2025

Comet 3I/ATLAS Today: Interstellar Visitor Nears Closest Approach to Earth — What’s Happening on Dec. 18, 2025 and How to Watch

Comet 3I/ATLAS Today: Interstellar Visitor Nears Closest Approach to Earth — What’s Happening on Dec. 18, 2025 and How to Watch

December 18, 2025 — The interstellar comet 3I/ATLAS (sometimes written as 3I/Atlas) is back in the spotlight today as it heads into a key milestone: its closest approach to Earth early Friday, Dec. 19. It won’t be a dramatic “near miss” in everyday terms—NASA emphasizes the comet
18 December 2025
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Interstellar Comet 3I/ATLAS Nears Closest Earth Flyby on Dec. 19: New X‑ray Views, UN Tracking, and What Scientists Know Now

Interstellar Comet 3I/ATLAS Nears Closest Earth Flyby on Dec. 19: New X‑ray Views, UN Tracking, and What Scientists Know Now

December 15, 2025 — A rare visitor from beyond our solar system is making its final, headline-worthy sweep through the inner neighborhood — and the countdown to its closest pass by Earth is nearly over. Interstellar comet 3I/ATLAS (also designated C/2025 N1 (ATLAS)) will
15 December 2025
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Night Sky Tonight (Dec. 15, 2025): Geminids Encore, Orion Nebula Peak, and a Rare Interstellar Comet Turns Green

Night Sky Tonight (Dec. 15, 2025): Geminids Encore, Orion Nebula Peak, and a Rare Interstellar Comet Turns Green

December 15, 2025 brings a near-perfect recipe for skywatchers: long winter nights, a slim waning Moon, and a sky full of headline-worthy targets—plus a rare interstellar visitor that’s suddenly glowing green in new images. With the winter solstice now just days away, the Northern Hemisphere
15 December 2025
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Comet 3I/ATLAS Today (Dec. 15, 2025): The Interstellar Visitor Turns Green Ahead of Its Dec. 19 Flyby

Comet 3I/ATLAS Today (Dec. 15, 2025): The Interstellar Visitor Turns Green Ahead of Its Dec. 19 Flyby

On December 15, 2025, the solar system’s most talked-about “visitor” is back in headlines for two very comet-like reasons: it’s brightening and it’s glowing green. The object is Comet 3I/ATLAS—often shortened to “3I/Atlas comet”—the third confirmed interstellar object ever found passing through our neighborhood, after 1I/ʻOumuamua (2017) and 2I/Borisov (2019). 
15 December 2025
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Comet 3I/ATLAS Update (Dec. 13, 2025): New Green Glow, First X‑Ray Views, and What’s Next for the Interstellar Visitor

Comet 3I/ATLAS Update (Dec. 13, 2025): New Green Glow, First X‑Ray Views, and What’s Next for the Interstellar Visitor

On December 13, 2025, Comet 3I/ATLAS—the third confirmed interstellar object ever found crossing our solar system—is back in the headlines as astronomers release fresh observations that deepen the mystery (and the science) of this rare cosmic flyby. It’s not just
13 December 2025
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Comet 3I/ATLAS Update (Dec. 12, 2025): First X‑Ray View, Green Glow, and How to Spot the Interstellar Visitor

Comet 3I/ATLAS Update (Dec. 12, 2025): First X‑Ray View, Green Glow, and How to Spot the Interstellar Visitor

On December 12, 2025, the rare interstellar comet 3I/ATLAS (also written 3I/Atlas) is back in headlines for two reasons: a newly released X‑ray view from ESA’s XMM‑Newton and fresh Gemini North telescope images showing the comet looking noticeably greener—all as the object heads toward its closest approach to
13 December 2025
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