Reunion in space: The astronauts of the Shenzhou XVIII and Shenzhou XVII missions take a “family photo” together in the Tiangong space station on April 26 as they send their greetings to Earth from orbit. The Shenzhou XVIII manned spaceship successfully launched from the Jiuquan Satellite Launch Center on April 25, carrying three crew members – Ye Guangfu, Li Cong and Li Guangsu. They will carry out more than 90 experiments related to various fields in space, including raising four zebrafish in a sealed (密封的) fish tank.