This color mosaic of the Moon’s northern hemisphere, compiled by images taken by NASA’s Galileo spacecraft en route to Jupiter, shows compositional variations.
Bright pinkish areas are highlands materials such as the lava-filled Crisium impact basin, pictured on the bottom.
Blue-to-orange shades indicate volcanic lava flows.
Left of Crisium, dark blue Mare Tranquillitatis is richer in titanium than the green and orange maria above it.
(Credit: NASA/JPL)