True colour (top) and false-colour (bottom) images of the Moon's northern hemisphere showing surface soil compositions. Pink areas are upland formations, such as the ring around the Mare Crisium impact basin at upper left. Dark blue areas are titanium-rich basalts, the largest of these is the Sea of Tranquility at to centre. Orange ares are titanium-poor basalts. Pale blue colours represent thin, mineral rich soils from relatively recent impacts. The data for these images were gathered by the Galileo spacecraft on 7th December 1992 during its second gravity-assist flyby of Earth. Galileo's final destination is the planet Jupiter.