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They learned about NASA and some of its projects , including plants produced on the Space Shuttle under the direction of an Ag Center scientist ; participated in a live video conference with NASA personnel at the Johnson Space Center in Houston ; built rockets and boats and launched them ; viewed the planets and stars through a large , portable telescope ; learned about the physical sciences using concepts with pendulums , catapults , planes and boats ; explored the Internet , and used Global Positioning Systems . In a confrontation Monday at the gates to the Johnson Space Center in Houston , Soyuz commander Talgat Musabayev and Yuri Butarin refused to enter for required pre-flight training when NASA representatives informed Tito a variety of issues had to be resolved first . If he approves the flight , another briefing will be held at the Johnson Space Center in Houston to introduce the astronauts who will fly the mission . He currently directs a laboratory at the Johnson Space Center in which high temperature and pressure history of lunar and meteorite samples are duplicated experimentally . All three station crew members will fly back to the Johnson Space Center in Houston the day after landing .