Key Sciences of SPICA Mission: Planetary Formation, Exoplanets, and our Solar System M. Tamura, M. Takami, K. Enya, T. Ootsubo, M. Fukagawa, M. Honda, Y. K. Okamoto, S. Sako, T. Yamashita, S. Hasegawa et al. (4 more) Published online: 24 December 2009 DOI: 10.1051/spica/200902001