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Sungrazing comets, captured by the LASCO C1 and C2 Coronographs on board the SOHO spacecraft. A high resolution TIFF image can be found here. From the SOHO web page:
On Tuesday, 1998 June 2, telescopes on board the SOHO spacecraft viewed two sungrazing comets following similar but not identical orbits, and entering the tenuous outer atmosphere of the Sun --- the solar corona -- - never to reappear on the other side of the Sun. Shortly after the comets disappeared behind the occulting disks of the LASCO C1 and C2 coronagraphs, a bright coronal mass ejection (CME) with an enormous erupting prominence appeared on the southwest (lower right) limb of the Sun. (East and West are reversed in heliographic coordinates to match the compass directions for an earthbound observer.) The prominence eruption is visible in the SOHO EIT images.

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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