Astronomy Picture of the Day . Evidence Mounts for Water on the Moon . ... But researchers are now offering this archival picture as further evidence that humans might one day be able to use the Moon's newly discovered resource to directly quench their thirst. ... Perhaps not coincidentally, this picture was taken exactly 40 years ago, on April Fools Day .. ... NASA Web Site Statements, Warnings, and Disclaimers . ... U. Based on Astronomy Picture Of the Day . ... Water Discovered on the Moon . ...