 
 <prompt> text: ```For more than 40 years, scientists don dey find out how well human beings fit adapt to long periods for space. The International Space Station still dey provide valuable knowledge about spaceflight. But an earlier space station, Skylab, help make the current space project possible.

Canadian astronaut Chris Hadfield sing aboard the International Space Station on May 12, 2013. Him music video don become extremely popular. The astronaut play him own version of David Bowie's song Space Oddity. Him perform while dey float weightlessly, with images of planet earth and space dey show for the window behind am.

Chris Hadfield recently return home after nearly five months for the space station. For am, the long flight produce a hit video for YouTube and no major physical problems. But 40 years ago, scientists no know how humans go react to long-term spaceflight. To find out, NASA, the American space agency, launch Skylab for May, 1973. Over nearly one year, three teams of astronauts visit Skylab for stays of between 28 to 84 days. Dem learn how people dey react to extended periods for space.

Gerald Carr command Skylab 4. Him talk for one NASA event wey mark the 40th anniversary of Skylab's launch. Him talk say the loss of the body's muscle mass na one major concern. Astronauts for Skylab use exercise equipment to stay strong. The astronauts spend their workdays dey carry out experiments, including biomedical research.

Marshall Porterfield na the director of NASA's Space Life and Physical Sciences Division. Him talk say the Skylab astronauts' understanding of their own ability to deal with long-term spaceflight still dey help current astronauts. NASA talk say the next step for life away from Earth na one year-long space station mission, wey dem set for 2015.``` <response>: ```1. Skylab``` 