| 41. | An epilogue explains that many of the rock samples returned from the previous Apollo missions are now missing.
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| 42. | He said missions in this decade will concentrate on finding the best spot on Mars to pick up rock samples.
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| 43. | Scientists hope to collect 50 boxes of rock samples for later laboratory analysis _ a process that could take years.
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| 44. | They would climb to a site, select rock samples, and carry them back to their boats or amphibious M29 Weasel.
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| 45. | One afternoon Lasseter returned to camp with some concealed rock samples and announced that he had relocated the gold reef.
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| 46. | Planetary scientists say further proof of the rock's origins will come only from Martian rock samples collected in future missions.
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| 47. | In 2015, research by the University of Aberdeen discovered " high levels of selenium in rock samples from the Bowland shale"
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| 48. | After opening the hatches, the crew began the task of transferring the rock samples that had been collected on the surface.
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| 49. | Rock samples collected from the northern slopes of the mountain and streams rising from the mountain have revealed traces of tin.
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| 50. | The change may have occurred much more quickly, and researchers plan to refine their oxygen timetable by analyzing more rock samples.
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