2009 YD7
2009 YE7
2009 YE7, 2009 YF7, 2009 YG19
2009 YF
2009 YG
2009 YO
2009 YP
2009 YQ
2009 YR
2009 YS
2009 YS6
2009 YS6
2009 YS_6
2009 YT6
2009 YU6
2009 YV6
2009, Année Internationale de l'Astronomie
2009: the year of living dangerously
200dynamene
200km Decoy-state quantum key distribution with photon polarization