ISRO's Chandrayaan 2 detects water molecules on moon

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ISRO's Chandrayaan 2 detects water molecules on moon (Image: Pixabay)
ISRO's Chandrayaan 2 detects water molecules on moon (Image: Pixabay)

New Delhi : An instrument of Indian Space Research Organization's Chandrayaan 2 has detected the presence of hydroxyl (OH) and water molecules (H2O) on the moon’s surface, according to a study published in Current Science. 

The data was collected by the Imaging infrared spectrometer (IIRS), developed by Ahmedabad-based Space Applications Centre (SAC) of ISRO from the electromagnetic spectrum obtained from the lunar surface, further used to detect mineral composition.

Launched in 2019, Chandryaan 2 had managed 90% completion of its mission with its lander completely getting damaged, however, the orbiter remains active and is now used by scientists to make path-breaking discoveries from the lunar surface.

The instrument on Chandrayaan 2 has an instrument with wavelength of 0.8 to 5 micrometre, which enhances the ability to precisely distinguish between OH (hydroxyl) and H2O (water) molecules. 

Chandrayaan 1 had similar instrument but the wavelength was limited to between 0.4 to 3 micrometre.

Scientists then had questioned the accuracy of the data received from the instrument, saying it is harder to distinguish OH from H2O in its case.

The paper, authored by scientists from IIRS in Dehradun, SAC in Ahmedabad, UR Rao Satellite Centre and ISRO headquarters in Bengaluru, reveals that the formation of hydroxyl or water molecules occurs due to a process called space weathering, which is when the solar winds blow over the lunar surface. Another reason could be small meteorites interacting with the surface that could result in chemical changes. 

The find is also crucial for future planetary exploration for resource utilisation, the paper notes. “The proper interpretation of hydration feature through spectral analysis is significant as it provides important inputs regarding geology and geophysics of the mantle (of the moon) in terms of their mineralogy, chemical composition, rheology and solar–wind interaction."