U.S. National Space Biomedical Research Institute scientists say they are studying the possible negative effects lunar dust may have on visiting astronauts.

NSBRI researchers Kim Prisk and Chantal Darquenne are evaluating how long exposure to deposits of the tiny particles of moon dust can affect an astronaut's lungs in a reduced gravity environment. The researchers say their findings will influence the design of lunar bases and could also provide benefits for healthcare on Earth, such as improved delivery of aerosol medications.

During the 1960s and 1970s Apollo lunar missions, dust particles were easily transported via spacesuits into the lunar lander following moonwalks, officials said. Although there were no known illnesses due to exposure, scientists said lunar dust is a concern because it has properties comparable to that of fractured quartz -- a highly toxic substance.

However, the Apollo flights lasted only a few days. During the proposed return to the moon, astronauts might be exposed to lunar dust during missions that could last months.

As for benefits on Earth, the scientists said their findings might lead to a better understanding of how the lungs work and how particles distribute within the lungs.

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