Scientists have for the first time found convincing evidence that there is water on the moon, reports international media.
Previously, it was assumed that the moon's surface was dry, but in the 1990s, signs were found that there was ice on the moon.
In 2009, an Indian spacecraft made findings that indicated that there could be water on the lunar surface.
Now, scientists at NASA's Goddard Space Flight Center in Maryland have found evidence for water by analyzing the wavelengths reflected from the moon's surface.
The discovery could be of great importance for future expeditions to the moon.
"Water is a very precious commodity in space," Mahesh Anand, a professor of planetary science at the Open University in Milton Keynes, told The Guardian.
However, several question marks still remain, including the form in which the water molecules are stored and how deep into the ground the sources are.
To answer these questions, astronauts must be sent to the moon on drilling for water.
This could become a reality in 2024, when Nasa plans to send an expedition with two astronauts to the moon.