Washington: As billions of people on Earth stare at an imminent water shortage, precious, is being released into the lunar atmosphere by meteor showers from the Moon that can hamper future long-term exploration on the lunar surface.
Researchers from NASA and the Johns Hopkins University Applied Physics Laboratory in Laurel, Maryland, found that streams of meteoroids striking the Moon infuse the thin lunar atmosphere with a short-lived water vapour.
“We traced most of these events to known meteoroid streams, but the really surprising part is that we also found evidence of four meteoroid streams that were previously undiscovered,” said Mehdi Benna from NASA’s Goddard Space Flight Centre in Greenbelt, Maryland, and the lead author of the study published in the journal Nature Geosciences.
“The water being lost is likely ancient, either dating back to the formation of the Moon or deposited early in its history,” Benna added. The findings will help scientists understand the history of lunar water — a potential resource for sustaining long-term operations on the Moon and human exploration of deep space.
Earlier models had predicted that meteoroid impacts could release water from the Moon as a vapour, but scientists hadn’t yet observed the phenomenon. Now, the team has found dozens of these events in data collected by NASA’s Lunar Atmosphere and Dust Environment Explorer (LADEE) — a robotic mission that orbited the Moon to gather detailed information about the structure and composition of the thin lunar atmosphere.
“The Moon doesn’t have significant amounts of H2O or OH in its atmosphere most of the time,” said Richard Elphic, the LADEE project scientist. “But when the Moon passed through one of these meteoroid streams, enough vapour was ejected for us to detect it. And then, when the event was over, the H2O or OH went away,” Elphic said. To release water, the meteoroids had to penetrate at least three inches below the surface. —IANS
