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The sign accompanying the orbiter. It reads

Anatomy of a Planet

Scoping it Out

Hanging overhead is a full-scale engineering model of the Viking Orbiter spacecraft. In 1976, two of these vehicles arrived at Mars, each with a Viking Lander spacecraft attached. Their first job as to search the planet with cameras to find a safe and scientifically interesting spot for the landers to set down. Afterward, each orbiter spent several years mapping Mars to unlock its mysteries and pave the way for future missions. The Viking program was managed by the NASA Langley Research Center in Hampton.