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Space Exploration & the Cosmos
Orange Soil on the Moon
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<blockquote data-quote="Martian" data-source="post: 107874" data-attributes="member: 6511"><p>Oops. lol</p><p></p><p>I suppose it really depends on the moon's history. It is remarkable that lunar regolith and terrestrial rocks have identical isotopic compositions, implying they came from the same source. I would actually expect the moon to be more radioactive, since I'm fairly certain it doesn't have an ionosphere to protect it from cosmic rays and solar wind. I suppose the more reactive nuclides would have interacted with cosmic rays long ago and decayed to more stable isotopes.</p><p></p><p>Here's an idea to consider, regarding the formation of rust on the moon. Suppose there was a mixture of iron and various silicates, sitting there happily minding their own business. Normally, it would probably take a few electron volts to dissociate a silicate molecule into its constituent atoms. However, incoming cosmic rays are typically measured in MeV (millions of electron volts). Basically, it's enough energy to break apart molecules and reform them. Some radioactive minerals on earth exhibit a breakdown of their crystal lattice due to collisions with high speed particles. It's not much per collision, but it adds up over time. If this happened on the moon and even just a small portion of the molecules broke apart and recombined to form water, it could produce rust, even if there's otherwise no water to be found on the moon.</p><p></p><p>Also remember that meteors can contain ice.</p><p></p><p>What do you think?</p></blockquote><p></p>
[QUOTE="Martian, post: 107874, member: 6511"] Oops. lol I suppose it really depends on the moon's history. It is remarkable that lunar regolith and terrestrial rocks have identical isotopic compositions, implying they came from the same source. I would actually expect the moon to be more radioactive, since I'm fairly certain it doesn't have an ionosphere to protect it from cosmic rays and solar wind. I suppose the more reactive nuclides would have interacted with cosmic rays long ago and decayed to more stable isotopes. Here's an idea to consider, regarding the formation of rust on the moon. Suppose there was a mixture of iron and various silicates, sitting there happily minding their own business. Normally, it would probably take a few electron volts to dissociate a silicate molecule into its constituent atoms. However, incoming cosmic rays are typically measured in MeV (millions of electron volts). Basically, it's enough energy to break apart molecules and reform them. Some radioactive minerals on earth exhibit a breakdown of their crystal lattice due to collisions with high speed particles. It's not much per collision, but it adds up over time. If this happened on the moon and even just a small portion of the molecules broke apart and recombined to form water, it could produce rust, even if there's otherwise no water to be found on the moon. Also remember that meteors can contain ice. What do you think? [/QUOTE]
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