The LISA Pathfinder satellite was launched late last year, and has since March 1st 2016 been running science operations.
The satellite hosts two identical gold-platinum cubes, about 2 kg in mass, seperated by 38 cm. Both cubes float as 'free mass' in space with the satellite hovering around, but not touching the cubes. Optical interferometry monitors the relative separation between the cubes. The reuslts of one of these experiments are presented in Phys. Rev. Lett. 116, 231101, with a staggering force sensitivity of 5 femto-g.