Apollo 17 The wing of the eagle partially overlays the Moon, suggesting man's established presence there. The gaze of Apollo and the direction of the eagle's motion embody man's intention to explore further destinations in space. The patch includes, along with the colors of the U.S. flag (red, white, and blue), the color gold, representative of a "golden age" of spaceflight that was to begin with Apollo 17. The image of Apollo in the mission insignia is a rendering of the "Apollo Belvedere" sculpture. The insignia was designed by Robert McCall, with input from the crew. Like Apollo 15 and Apollo 16,
Moon landing of water for 24 hours on the ground, to protect the Moon from being contaminated by Earth organisms. Heat sterilization was also blamed for subsequent in-flight failures of the spacecraft computer on Ranger 4 and the power subsystem on Ranger 5. Only Ranger 4 reached the Moon in an uncontrolled crash impact on the far side of the Moon. Heat sterilization was discontinued for the final four Block III Ranger probes. These replaced the Block II landing capsule and its retrorocket with a heavier, more capable television system to support landing site selection for upcoming Apollo manned Moon landing missions.