Gaia spacecraft of the European Space Agency lifting off on a Soyuz rocket from Europe’s Spaceport in French Guiana, 19 December

Gaia is destined to create the most accurate map yet of the Milky Way. By making accurate measurements of the positions and motions of 1% of the total population of roughly 100 billion stars, it will answer questions about the origin and evolution of our home Galaxy. (Previous post & more information)

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