A billion‑star mapmaker
The Gaia spacecraft is redrawing the Milky Way, expanding stellar observations from about 2 million to 2 billion.Milky Way: Gaia’s Billion‑Star Revolution
How Gaia measures
By pinpointing parallax, Gaia maps distances and motions across a volume expanded by 100× in radius and 1,000× in precision.Milky Way: Gaia’s Billion‑Star Revolution
