Stupid mission description The mission aims to compile a 3D space catalogue of approximately 1 billion stars or roughly 1 of stars in the Milky Way Why 1 billion Because the rest are too far out so no parallax will be detectable Because the rest are too faint so Gaia won t see them How should anyone know it ll be a billion if most of them will be seen for the first time Will the mission stop when it s found a billion That is stupid ad talk aimed at people who are stupid It s not a mission target Nobody will care if it gets 500 million or 2 5 billion stars