Once in orbit, the crew entered the 40 feet (12 m) long pressurized Spacelab module to commence over 40 science experiments to take place during the mission.During the test, Columbia's vernier Reaction Control System jets were gently pulsed to boost the Shuttle's altitude without jarring any of the mission payloads.Failure of booster seals on the lower sections of Space Shuttle Challenger's right SRB ultimately caused the orbiter to break up mid-flight in 1986.[4][5] Due to the issue, STS-79 which was meant to dock with the Space Station Mir and return astronaut Shannon Lucid, was delayed.[citation needed] This article incorporates public domain material from websites or documents of the National Aeronautics and Space Administration.