... Method of measurements is based on recording gamma-rays from natural radionuclides in rocks and gamma-rays generated by nuclear interactions of cosmic rays with elements of Martian surface rocks. ...
... All of Uranus' large moons are a mixture of about 40-50% water ice with the rest rock, a somewhat larger fraction of rock than Saturn 's large moons such as Rhea . ...
... All of Uranus' large moons are a mixture of about 40-50% water ice with the rest rock, a somewhat larger fraction of rock than Saturn 's large moons such as Rhea . ...
... All of Uranus' large moons are a mixture of about 40-50% water ice with the rest rock, a somewhat larger fraction of rock than Saturn 's large moons such as Rhea . ...
... All of Uranus' large moons are a mixture of about 40-50% water ice with the rest rock, a somewhat larger fraction of rock than Saturn 's large moons such as Rhea . ...
... Sojourner Gets Her Rock This "movie" was generated from 23 separate frames taken by ... the Alpha Proton X-Ray Spectrometer (APXS) and making its move up against the rock ...
... The exposed portions of the rock are similar in color to basaltic rocks on Earth. ... The rounded rock in the center foreground is about 20 centimeters (8 inches) wide, while the angular rock farther back and to ...
... when Mars was warmer and wetter, water penetrated fractures in the subsurface rock ... years ago, a huge comet or asteroid struck Mars, ejecting a piece of the rock ...