AIRLOCK MODULE Used to exit Skylab for outside repair and maintenance activities; contained control panels for Skylab systems. Length: 5.3 m (17 ft 6 in) Diameter (max.): 6.5 m (21 ft 8 in) Weight: 22,200 kg (49,000 lb) MULTIPLE DOCKING ADAPTER Docking ports for crews' Apollo spacecraft and control center for the Apollo telescope mount solar observatory. Length: 5.2 m (17 ft 4 in) Diameter: 3 m (10 ft) Weight: 6,200 kg (13,800 lb) APOLLO TELESCOPE MOUNT Observatory housing eight instruments to observe the Sun in visible light, ultraviolet light, and x-rays. Length: 4.4 m (14 ft 8 in) Diameter: 31 m (102 ft) with solar arrays extended Weight: 11,100 kg (24,650 lb)

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