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Explanation: Where do comet tails come from? There are no obvious places on the nuclei of comets from which the jets that create comet tails emanate. Last year, though, ESA's Rosetta spacecraft not only imaged a jet emerging from Comet 67P/Churyumov-Gerasimenko, but flew right through it. Featured is a telling picture showing a bright plume emerging from a small circular dip bounded on one side by a 10-meter high wall. Analyses of Rosetta data shows that the jet was composed of both dust and water-ice. The mundane terrain indicates that something likely happened far under the porous surface to create the plume. This image was taken last July, about two months before Rosetta's mission ended with a controlled impact onto Comet 67P's surface.
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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 30 B Comet Lemmon Brightens
- APOD: 2025 September 29 B Two Camera Comets in One Sky
- APOD: 2025 September 26 B A SWAN an ATLAS and Mars
- APOD: 2025 September 18 B Comet C/2025 R2 SWAN
- APOD: 2025 September 16 B New Comet SWAN25B over Mexico
- APOD: 2025 July 7 B Interstellar Comet 3I ATLAS
- Comet C/2025 F2 SWAN