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gptkb:TES_(Thermal_Emission_Spectrometer)_on_Mars_Global_Surveyor
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evidence of past water activity on Mars
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gptkb:Moon_Rocks
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age of lunar surface
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gptkb:canal_rays
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gptkb:proton
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gptkb:Moon_Rocks
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Moon's lack of water
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gptkb:Moon_Rocks
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Moon's volcanic history
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gptkb:Moon_Rocks
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evidence for Giant Impact Hypothesis
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gptkb:Period-Luminosity_Relation
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expansion of the universe
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gptkb:Differential_Microwave_Radiometers_(DMR)
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anisotropies in the cosmic microwave background
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gptkb:Moon_Rocks
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differences from Earth rocks
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