Partners from several European countries collaborated on an eTwinning project about space science and astronomy in primary schools. Students learned about aspects of space science included in their curricula by working in international groups. They explored topics like astronauts, the International Space Station, the solar system, galaxies, and more. The project helped students develop their understanding of scientific concepts related to the universe through hands-on and interactive activities. It concluded that the project effectively built on students' existing ideas and knowledge to help them learn.