India's maiden moon mission Chandrayaan-I has detected evidence of water across the lunar surface, scientists announced on Thursday.

Moon Mineralogy Mapper, a NASA instrument onboard Chandrayaan-I, detected wavelengths of reflected light that would indicate a chemical bond between hydrogen and oxygen in materials on the thin layer of upper soil.

The Moon Mineralogy Mapper or M3 has confirmed existence of water on moon by analysing the data collected from Chandrayaan-I.

The finding ends four-decade long speculation on whether there is water on moon.

Scientists first claimed that water existed on moon about 40 years ago after they analysed rock samples brought to earth as souvenirs by Apollo astronauts.

But they had doubts about the findings as the boxes in which the moon rocks were brought to earth had leaked contaminating the samples with air from the atmosphere.

Scientists believe that the water could have been formed due to interaction of oxygen present in rocks and soil on moon with hydrogen in the form of protons emitted by the sun as a result of nuclear fusion.

As these protons hit the moon, they break apart oxygen bonds in soil materials, and where free oxygen and hydrogen are together, there's a high chance that trace amounts of water will be formed, said Larry Taylor from the University of Tennessee, who was among the M3 team of scientists.

The M3 instrument analysed how sunlight reflected off the lunar surface to identify water particles in which scientists observed elements of chemical bonding alike water.

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