S. W. Squyres R. E. Arvidson H.M. Arneson D. Bass D. Blaney N. Cabrol W. Calvin J. Farmer W. H. Farrand W. Goetz M. Golombek J. A. Grant R. Greeley E. Guinness A. G. Hayes M.Y.H. Hubbard Kenneth E. Herkenhoff M. J. Johnson J. R. Johnson J. Joseph K.M. Kinch M.T. Lemmon R. Li M.B. Madsen J.N. Maki M. Malin E. McCartney S. McLennan H.Y. McSween Jr. D. W. Ming J.E. Moersch R.V. Morris E.Z.N. Dobrea T. J. Parker J. Proton J. W. Rice Jr. F. Seelos J. Soderblom Laurence A. Soderblom J. N. Sohl-Dickstein R.J. Sullivan M.J. Wolff A. Wang J.F. Bell III 2004 Panoramic Camera images at Gusev crater reveal a rock-strewn surface interspersed with high- to moderate-albedo fine-grained deposits occurring in part as drifts or in small circular swales or hollows. Optically thick coatings of fine-grained ferric iron-rich dust dominate most bright soil and rock surfaces. Spectra of some darker rock surfaces and rock regions exposed by brushing or grinding show near-infrared spectral signatures consistent with the presence of mafic silicates such as pyroxene or olivine. Atmospheric observations show a steady decline in dust opacity during the mission, and astronomical observations captured solar transits by the martian moons, Phobos and Deimos, as well as a view of Earth from the martian surface. application/pdf 10.1126/science.1100175 en American Association for the Advancement of Science (AAAS) Pancam multispectral imaging results from the Spirit Rover at Gusev crater article