ESA / NASA · 1995 — 2025
Thirty years
Thirty years
at the edge
of the Sun.
The Solar and Heliospheric Observatory has watched our star without pause from the L1 Lagrange point — through coronal mass ejections, near-loss in 1998, helioseismic revelations, and more than five thousand comets.
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Years of operation
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Comets discovered
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Scientific publications
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Doctorate theses
Interactive timeline
From launch to legacy.
Filter by category. Click any milestone for the full story, image, and source links. Approximate dates are labeled as such.
Sources
Built on primary mission record.
Every dated fact on this page is drawn from the ESA and NASA pages below. Visit the originals for instrument-level detail, daily recovery logs, and the live Sungrazer Project.