Pictures of Amalthea were taken in 1979 and 1980 by the Voyager 1 and 2 spacecraft , and later , in more detail , by the Galileo orbiter in the 1990s . Amalthea was photographed in 1979 and 1980 by the Voyager 1 and 2 spacecraft , and later , in more detail , by the Galileo orbiter in the 1990s .