NASA's SOFIA Finds Water On The Moon's Sunlit Side!

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The Clavius Crater on the Moon as seen by NASA's Lunar Reconnaissance Orbiter. The SOFIA observatory has detected water ice in shadowed regions of this sunlit lunar location ((Image credit: NASA/Moon Trek/USGS/LRO)

The presence of ice in the permanently shadowed craters around the Moon's poles has been known for some time. However, researchers had been unsure if the hydration detected on the satellite's sunlit areas was "molecular" water (H2O), or hydroxyl (OH), a molecule that's one hydrogen atom shy of becoming water. On October 26, 2020, NASA confirmed that the liquid was indeed water.

“We had indications that H2O – the familiar water we know – might be present on the sunlit side of the Moon,” said Paul Hertz, Director of Astrophysics at NASA. “Now we know it is there. This discovery challenges our understanding of the lunar surface and raises intriguing questions about resources relevant for deep space exploration.”

The discovery was made using data collected by NASA’s Stratospheric Observatory for Infrared Astronomy (SOFIA). The modified Boeing 747 aircraft, which can fly its large telescope at altitudes of up to 45,000 feet, allows researchers to clearly observe space objects. The water molecules — detected using a special infrared camera capable of discerning between the wavelengths of H2O and OH — were found in the Clavius Crater. Located on the Moon's Southern Hemisphere, the large crater can be clearly seen from Earth.

The Moon’s Clavius Crater, with an illustration depicting water trapped in the lunar soil there, along with an image of NASA’s SOFIA, which found lunar water. (Credit: NASA/ Daniel Rutter)

However, before you start packing your bags for our satellite, be warned that the water concentration is extremely low — about 100 to 412 parts per million. To put it in perspective, the Sahara Desert has about 100 times more water! "This is not puddles of water but instead water molecules that are so spread apart that they do not form ice or liquid water," said NASA researcher Casey Honniball, who led the study. Though not enough to sustain humans, the discovery is significant because water is a rare and precious resource in deep space.

The scientists speculate that the H2O molecules may have been deposited by the tiny meteorites that are continually bombarding the Moon's surface. Another plausible explanation involves a multi-step process where the Sun's solar wind brings hydrogen to the Moon, which then reacts with oxygen-bearing minerals in the soil to create hydroxyl. This hydroxyl could later be transformed into water from the micrometeorites' radiation.

The Clavius Crater is one of the Moon's largest craters and visible from Earth (Jstuby/ CC0,/ Wikimedia Commons)

Also perplexing is how the water escapes evaporation. The liquid could be trapped in tiny bead-like structures in the soil that form from the intense heat generated from the micrometeorite impacts. Alternatively, the H2O molecules may be hidden inside the lunar soil grains and sheltered from the Sun.

“Without a thick atmosphere, water on the sunlit lunar surface should just be lost to space,” said Honniball. “Yet somehow we’re seeing it. Something is generating the water, and something must be trapping it there.”

NASA plans to conduct follow-up missions to determine how widespread the water is across the lunar surface. The findings will allow the US space agency to find the perfect landing for its Artemis mission that will take the first woman and next man to explore the Moon more extensively in 2024.

Resources: Space.com, NASA.gov

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253 Comments
  • bruhwhyyou
    bruhwhyyoualmost 4 years
    if the H2O on the moon is so small that it cant even make ice or liquid water then it has to be a gas but its staying there and not moving which is crazy
  • bruhwhyyou
    bruhwhyyoualmost 4 years
    what could be generating the water on the moon is it the moon's core and how is the water not floating off in space because of the moons small atmosphere
    • k1ng_snd
      k1ng_sndalmost 4 years
      how would water get on the moon?????
      • piper_123
        piper_123almost 4 years
        wow this is so cool
        • zebra0452
          zebra0452almost 4 years
          5th grade here! I really like this website?! There's a lot if fun facts and more to explore!! #keep on exploring
          • zebra0452
            zebra0452almost 4 years
            My uncle works for the N.A.S.A it's pretty cool.
            • cs199443
              cs199443almost 4 years
              this is really awesome news i can't wait to hear what happens next!!!!
              • shadow2008
                shadow2008almost 4 years
                This is so COOL!
                • asand55
                  asand55almost 4 years
                  I'm in 5th grade and I think when I read these space articals I want to be a scientist or work for N.A.S.A
                  • heyheygirl
                    heyheygirlalmost 4 years
                    Hey I'm in 3rd grade and I think space is pretty awesome. Also, I love this site.