CAPE CANAVERAL, Fla. — Four astronauts returned to Earth on Monday, riding home with SpaceX to end a 200-day space station mission that began last spring. Their capsule parachuted into the Gulf of Mexico off the coast of Pensacola, Florida, in darkness. Recovery boats quickly moved in with spotlights. Their homecoming — coming just eight hours after leaving the International Space Station — paved the way for SpaceX’s launch of their four replacements as early as Wednesday night. The newcomers were scheduled to launch first, but NASA switched the order because of bad weather and an astronaut’s …

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