by Marlowe HOOD PARIS, France (AFP) — The European Space Agency will unveil on Wednesday a three-dimensional map of a billion stars in our galaxy that is 1,000 times more complete than anything existing today. A space-based probe called Gaia, launched in December 2013, has been circling the Sun 1.5 million kilometers (nearly a million miles) beyond Earth’s orbit and has been discreetly snapping pictures of the Milky Way. The satellite’s billion-pixel camera, the largest […]