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An eruptive prominence, captured by the Extreme ultraviolet Imaging Telescope (EIT) on board the SOHO spacecraft. A high resolution GIF image can be found here. From the SOHO web page:
SOHO-EIT image from 14 September 1997 showing a huge eruptive prominence in the resonance line of singly ionized helium (He II) at 304 Angstroms in the extreme ultraviolet. The material in the eruptive prominence is at temperatures of 60,000 - 80,000 K, much cooler than the surrounding corona, which is typically at temperatures above 1 million K.

SOHO Copyright and reproduction issues (reproduced from the SOHO web page:
Use of SOHO images for public education efforts and non-commercial purposes is strongly encouraged and requires no expressed authorization. It is requested, however, that any such use properly attributes the source of the images as: "Courtesy of SOHO [instrument name]1 consortium. SOHO is a project of international cooperation between ESA and NASA."

1 where [instrument name] is the instrument that provided the images.

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