English: S91-52337 (1991) --- (Artist's concept of possible exploration programs.) The first humans on Mars may revisit the landing site of the Viking 2 Lander in order to study the effects that the Martian surface and atmosphere have had on the spacecraft. These images produced for NASA by Pat Rawlings. Technical concepts from NASA's Planetary Projects Office, Johnson Space Center (JSC).
El lloc web de la NASA disposa d'un gran nombre d'imatges de l'Agència Espacial Russa, o soviètica, i d'altres agències no nord-americanes. Aquestes imatges no són necessàriament en el domini públic.
{{Information |Description ={{en|1=S91-52337 (1991) --- (Artist's concept of possible exploration programs.) The first humans on Mars may revisit the landing site of the Viking 2 Lander in order to study the effects that the Martian surface and atmosph