Captivating view of the Milky Way galaxy illuminating the starry night sky.

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

A high-resolution image capturing the dense star field of the Milky Way galaxy.

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

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