In May, 2009 European Space Agency (ESA) successfully launched two of its most ambitious astronomy missions to unveil the secrets of the darkest, coldest and oldest parts of the universe. Name the two most complex science satellites ever built in Europe used in this mission.

Options

A. ERS-2 and ERS-Envisat
B. GOCE and Proba-1
C. Herschel and Planck
D. Rosetta and Hubble