The European Space Agency 's Gaia mission, launched 19 December 2013, is expected to measure parallax angles to an accuracy of 10 micro arcseconds for all moderately bright stars, thus mapping nearby stars (and potentially planets) up to a distance of tens of thousands of light-years from Earth. Data Release 2 in 2018 claims mean errors for the parallaxes of 15th magnitude and brighter stars of 20–40 microarcseconds.