After the 1970s, the Moon was largely left unexplored till the 1990s. Moon exploration began again in the 1990s with the US sending three probes that took new pictures and explored the lunar surface with more scientifically advanced instruments.
The orbiter Galileo passed by the Moon twice in 1990 and 1992, while taking a roundabout path to Jupiter. In 1994, Clementine orbited the Moon. Four years later, Lunar Prospector was placed in the orbit around the Moon. Both Clementine and Lunar Prospector returned with evidences of the presence of water on the lunar surface, something that scientists had long believed existed. However, when the Lunar Prospector crashed onto the surface of the Moon in 1999, it failed to detect the presence of water in the debris.
Picture Credit : Google