Gravitational microlensing is a method for discovering extra-solar planets. It is different to other techniques in that it is sensitive to planets in orbits around their host star where scientists think planets form most readily. In a recent work, Daisuke Suzuki of the Japan/New Zealand MOA collaboration announced that the most likely mass of such planets is about that of Neptune. The story was picked up by the New Zealand Herald today.
To reach this conclusion, Suzuki and his co-authors analysed a set of microlensing planets that have already been discovered, conducting a statistical analysis to infer the most likely planet mass of these cold planets. One of the planets included in the planet which I announced in Monthly Notices last year. The discovery and announcement of these planets power the sort of statistical analyses like that of the Suzuki et al result.
arXiv version of paper: http://adsabs.harvard.edu/abs/2016arXiv161203939S
Additional graphics: http://svs.gsfc.nasa.gov/cgi-bin/details.cgi?aid=12425
Video on YouTube: https://youtu.be/qzlR3kBCLYM