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Explanation: Why does Comet ATLAS have such colorful tails? Last week Comet C/2024 G3 (ATLAS) passed its closest to the Sun -- well inside the orbit of Mercury -- and brightened dramatically. Unfortunately, the comet was then so angularly near the Sun that it was very hard for humans to see. But NASA's SOHO spacecraft saw it. Pictured is a SOHO (LASCO C3) image of Comet ATLAS that is a composite of several different color filters. Of the several tails visible, the central white tails are likely made of dust and just reflecting back sunlight. The red, blue, and green tails are likely ion tails with their colors dominated by light emitted by specific gases that were ejected from the comet and energized by the Sun. Currently, Comet ATLAS is showing long tails in southern skies but fading as it moves out of the inner Solar System.
Growing Gallery:
Comet ATLAS (G3)
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NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Based on Astronomy Picture
Of the Day
Publications with keywords: comet
Publications with words: comet
See also:
- APOD: 2025 September 29 Á Two Camera Comets in One Sky
- APOD: 2025 September 26 Á A SWAN an ATLAS and Mars
- APOD: 2025 September 18 Á Comet C/2025 R2 SWAN
- APOD: 2025 September 16 Á New Comet SWAN25B over Mexico
- APOD: 2025 July 7 Á Interstellar Comet 3I ATLAS
- Comet C/2025 F2 SWAN
- APOD: 2025 February 5 Á Comet G3 ATLAS Setting over a Chilean Hill