Three astronauts and a cosmonaut returned to Earth on Friday after spending about seven months on board the International Space Station (ISS). A SpaceX capsule carrying the four splashed down in the Gulf of Mexico, off the US state of Florida, after a more than 30-hour journey from the ISS. NASA’s Crew-8 mission includes astronauts Matthew Dominick, Michael Barratt and Jeanette Epps, as well as Russian cosmonaut Alexander Grebenkin. The US space agency said the crew carried important research results with them in the capsule. The Crew 8 conducted research on board the ISS involving around 200 …