Gaia stops observing
After about twelve years of scanning, the European Space Agency ended Gaia's science observations; following technology tests the spacecraft was passivated and moved out of its orbit around the Sun-Earth L2 point on 27 March 2025. The astrometry it collected underpins the modern empirical Hertzsprung-Russell diagram, because a luminosity is only as good as the distance behind it.
Historical — it happened, and the record is settled.
Subjects
- Gaia (ESA astrometric survey) · mission · Sun-Earth L2, then heliocentric orbit · not located
- Hertzsprung-Russell diagram · model · not located
Evidence
Partly verified — Core facts are sourced; some optional detail is deliberately absent.
Gaia end of observations and spacecraft passivation
Supports the 15 January 2025 end of science observations, the 27 March 2025 passivation, the December 2026 planned date for Data Release 4 and the description of DR4 as covering all data types for the full nominal mission. The pages were not fetched because the domain was blocked; content comes from search summaries of those ESA pages.
European Space Agency (ESA Cosmos) · 2025 · Partly verified
ESA Cosmos, "Gaia spacecraft end of observations" and "Spacecraft passivation", cosmos.esa.int/web/gaia
Recorded on Gaia (ESA astrometric survey)
Related
Related because they share a subject in the Atlas — never because the text looks similar.
- Gaia Data Release 4 scheduled · 2026-12 (planned)
- Hertzsprung and Russell independently plot luminosity against temperature · 1911-1913