“The models were right”: astronomers find ‘missing’ matter (www.esa.int)

After a thorough evaluation, ESA preselected the proposals of the following Challengers:...
Launched on 19 December 2013, Gaia’s fuel tank is now approaching empty – it uses about a dozen grams of cold gas per day to keep it spinning with pinpoint precision. But this is far from the end of the mission.
In brief...