Immediately within the historical past of astronomy, ESA’s marathon galaxy-mapping mission concludes.
Gaia’s map of the Milky Manner displays the observatory’s measurements of about 1.7 billion stars. Credit score: ESA/Gaia/DPAC
On Jan. 15, 2025, the Gaia spacecraft took its final picture. Then the craft ran a ultimate spherical of engineering assessments, fired its thrusters to depart Earth behind, and slipped into an orbit across the Solar, lastly turning off on March 27.
After greater than a decade in operation, 3 trillion observations, and a couple of billion stars noticed, Gaia earned its retirement. Launched by the European House Company (ESA) in 2013, Gaia’s purpose was “to map a billion stars,” and it succeeded. Compiling the map of the place these stars are and the way they transfer paints an image of our whole galaxy — even the darkish matter, whose gravitational affect subtly tugs on the celebrities.
Alongside the best way, Gaia discovered brown dwarfs, exoplanets, and quasars. Peering right down to twentieth magnitude, Gaia additionally spied stars within the Milky Manner’s satellite tv for pc galaxies, the small stellar cities that orbit simply exterior our personal, to disclose how they work together with our galaxy now and within the distant previous.
Although Gaia’s observations are full, scientists are nonetheless analyzing the lots of of terabytes of data despatched from house. And the Gaia knowledge are being launched to the general public in phases, as is frequent for many massive, long-lasting surveys. However the knowledge are already proving wildly helpful, informing the science of exoplanets, black holes, and extra.
