Toxicological trivia from July 22, 2015: Perhaps the biggest problem with that future Moon explorers will have are non cosmic rays or solar storms, but moondust. Indeed, it is considered that could be toxic for at least long term human. Only, as we have samples of regolith so it called fine dust that covers the entire surface of the moon result of billions of years of constant erosion impacts micrometeoros- nine places on the lunar surface;a) Six of the Apollo missions and three Soviet probes Moon Ye-8-5;b) Six of  Soviet probes Moon Ye-8-5 and three of the Apollo missions;c) None of the previous statements is correct.

Correct Answer: a. Read more in Spanish page: The fine powder that covers the entire moon (regolith) could be toxic to humans