Full coverage: China Tiangong-2 Space Lab Launch

During their stay in the space, the two astronauts worked for eight hours a day, six days a week. They completed more than 40 experiments in the traveling space lab.

They planted and harvested lettuce seeds in the space. It was China's first full experiment on plants from seeding to harvesting in space.

They also fed the specially bred silkworms they brought to space. Astronauts brought out the first silkworm and gave it a zero-gravity flight. This experiment allowed Chinese scientists to study and compare how space affects the silkworms' growth patterns.

Their 33-day journey was so far the longest stay in space by Chinese astronauts. Previously, the longest space trip involving Chinese astronauts was the 15-day Shenzhou-10 mission in June 2013.