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NASA's SpaceX Crew-4 astronauts, who spent 170 days in orbit aboard the Dragon spacecraft, completed the agency's fourth commercial crew mission to the International Space Station by safely splashing down the coast of Jacksonville, Florida on Friday.NASA astronauts Bob Hines, Kjell Lindgren, and Jessica Watkins and ESA (European Space Agency) astronaut Samantha Cristoforetti returned to Earth in a parachute-assisted splashdown at 4:55 p.m. EDT.Teams aboard SpaceX recovery vessels retrieved the spacecraft and astronauts. After returning to shore, all astronauts will fly to NASA's Johnson Space Center in Houston. Cristoforetti then will board a plane to Europe."Welcome home Crew-4! This international crew has spent nearly six months on the International Space Station conducting science for the benefit of all. Their work aboard the orbiting laboratory will help prepare future explorers for future space missions," said NASA Administrator Bill Nelson.He added, "Working and living on the space station is the opportunity of a lifetime, but it also requires these explorers to make sacrifices, especially time away from loved ones. Kjell, Bob, Jessica and Samantha, thank you for your contributions over the past six months to science, innovation, and discovery!"The Crew-4 mission launched at 3:52 a.m. EDT on April 27 on a Falcon 9 rocket from NASA's Kennedy Space Center in Florida. Less than 16 hours later, Dragon docked to the Harmony module's space-facing port. The astronauts undocked from the same port at 12:05 p.m. on Friday, to begin the trip home.Hines, Lindgren, Watkins, and Cristoforetti travelled 72,168,935 miles during their mission, spent 170 days aboard the space station, and completed 2,720 orbits around Earth. Lindgren has logged 311 days in space over his two flights, and with the completion of their flight today, Cristoforetti has logged 369 days in space on her two flights, making her second on the all-time list for most days in space by a woman. The Crew-4 mission was the first spaceflight for Hines and Watkins.Throughout their mission, the Crew-4 astronauts contributed to a host of science and maintenance activities and technology demonstrations. Cristoforetti completed two spacewalks with Roscosmos cosmonaut Oleg Artemyev to perform station maintenance and upgrades.Crew-4 continued work on investigations documenting how improvements to the space diet affect immune function and the gut microbiome, determining the effect of fuel temperature on the flammability of a material, exploring possible adverse effects on astronaut hearing from equipment noise and microgravity, and studying whether additives increase or decrease the stability of emulsions.The astronauts also investigated microgravity-induced changes in the human immune system similar to ageing, tested a novel water-reclamation membrane, and examined a concrete alternative made with a material found in lunar and Martian dust.The spacecraft, named Freedom by Crew-4, will return to Florida for inspection and processing at SpaceX's Dragon Lair, where teams will examine the spacecraft's data and performance throughout the flight.The Crew-4 flight is part of NASA's Commercial Crew Program and its return to Earth follows on the heels of NASA's SpaceX Crew-5 launch, which docked to the station on October 6, beginning another science expedition.The goal of NASA's Commercial Crew Program is safe, reliable, and cost-effective transportation to and from the International Space Station. This already has provided additional research time and has increased the opportunity for discovery aboard humanity's microgravity testbed for exploration, including helping NASA prepare for human exploration of the Moon and Mars.( With inputs from ANI )Disclaimer: This post has been auto-published from an agency feed without any modifications to the text and has not been reviewed by an editor

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