A tribute to supreme planet-hunter Bill Borucki

Bill Borucki Kepler mission We pay tribute to supreme planet hunter William Borucki, who retires this week from NASA. Bill Borucki spent decades first advocating for a transit-search satellite and then leading the Kepler mission to outstanding success. Kepler has now found over 1000 transiting exoplanets, and in particular has opened up whole new fields of research on small planets and on multiple-planet systems.