7898 20260204094652.0 Lobel, A. Gaia Observes a Cosmic Clock Inside a Large Planetary Nebula 2023 2023-11-04 The ESA Gaia mission website recently published an image of a planetary nebula, supplemented with three years of data gathered by the satellite. Inside this object, twinkles a blue dot with a very regular pulse of light. This is the mother binary star system of the planetary nebula. Truly a hefty cosmic clock in our galaxy. Belspo/ Prodex2023/ Prodex2023 NO ESA/Gaia/DPAC Planetary Nebula ESA-Gaia photometry ESA-Gaia spectroscopy Sordo, R. Creevey, O. Garcia-Lario, P. Thevenin, F. Roegiers, T. DPAC, CU8 alex.lobel@ksb-orb.be https://www.astro.oma.be/en/gaia-observes-a-cosmic-clock-inside-a-large-planetary-nebula/ https://www.cosmos.esa.int/web/gaia/iow_20231031 PRESSREL