KENNEDY SPACE CENTER, Florida—Preparations for the first human spaceflight to the Moon in more than 50 years took a big step forward this weekend with the rollout of the Artemis II rocket to its launch pad.

The rocket reached a top speed of just 1 mph on the four-mile, 12-hour journey from the Vehicle Assembly Building to Launch Complex 39B at NASA's Kennedy Space Center in Florida. At the end of its nearly 10-day tour through cislunar space, the Orion capsule on top of the rocket will exceed 25,000 mph as it plunges into the atmosphere to bring its four-person crew back to Earth.

"This is the start of a very long journey," said NASA Administrator Jared Isaacman. "We ended our last human exploration of the moon on Apollo 17."

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KENNEDY SPACE CENTER, Florida—The rocket NASA is preparing for sending four astronauts on a trip around the Moon will emerge from its assembly building on Florida's Space Coast early Saturday for a slow crawl to its seaside launch pad.

Riding atop one of NASA's diesel-powered crawler transporters, the Space Launch System rocket and its mobile launch platform will exit the Vehicle Assembly Building at Kennedy Space Center around 7:00 am EST (11:00 UTC). The massive tracked transporter, certified by Guinness as the world's heaviest self-propelled vehicle, is expected to cover the four miles between the assembly building and Launch Complex 39B in about eight to 10 hours.

The rollout marks a major step for NASA's Artemis II mission, the first human voyage to the vicinity of the Moon since the last Apollo lunar landing in December 1972. Artemis II will not land. Instead, a crew of four astronauts will travel around the far side of the Moon at a distance of several thousand miles, setting the record for the farthest humans have ever ventured from Earth.

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Two Americans, a Japanese astronaut, and a Russian cosmonaut returned to Earth early Thursday after 167 days in orbit, cutting short their stay on the International Space Station by more than a month after one of the crew members encountered an unspecified medical issue last week.

The early homecoming culminated in an on-target splashdown in the Pacific Ocean off the coast of San Diego at 12:41 am PST (08:41 UTC) inside a SpaceX Crew Dragon spacecraft. The splashdown occurred minutes after the Dragon capsule streaked through the atmosphere along the California coastline, with sightings of Dragon's fiery trail reported from San Francisco to Los Angeles.

Four parachutes opened to slow the capsule for the final descent. Zena Cardman, NASA's commander of the Crew-11 mission, radioed SpaceX mission control moments after splashdown: "It feels good to be home, with deep gratitude to the teams who got us there and back."

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NASA officials said Thursday they have decided to bring home four of the seven crew members on the International Space Station after one of them experienced a "medical situation" earlier this week.

The space agency has said little about the incident, and officials have not identified which crew member suffered the medical issue. James "JD" Polk, NASA's chief health and medical officer, told reporters Thursday the crew member is "absolutely stable" but that the agency is "erring on the side of caution" with the decision to return the astronaut to Earth.

The ailing astronaut is part of the Crew-11 mission, which launched to the station August 1 and was slated to come back to Earth around February 20. Instead, the Crew-11 astronauts will depart the International Space Station (ISS) in the coming days and head for reentry and a parachute-assisted splashdown in the Pacific Ocean off the coast of California.

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Someone on the International Space Station suffered an unspecified "medical situation" Wednesday, prompting the postponement of a planned spacewalk and raising the possibility of an early return for a portion of the lab's seven-person crew, NASA said in a statement.

NASA has never ordered a medical evacuation from space before, but the option has always been available at the International Space Station with lifeboats ready for activation.

The space agency announced the spacewalk postponement Wednesday afternoon due to a "medical concern" with a member of the space station's crew. NASA officials declined to identify the crew member or release further details about their condition, citing medical privacy restrictions.

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