INTRO

The Royal Institute of Technology (KTH) and Stockholm House of Science offer high school projects on cosmic rays to Swedish students in the final year of high school. Muon detectors of different sizes are available for students to borrow, or use in our research labs. The participating students pose their own research questions, which they then test with one or more of our muon detectors. As part of this project a muon detector is launched on a weather balloon once a year to measure the cosmic ray flux at altitudes up to 35 000 km. The data from each flight is collected in a database which is freely available to anyone interested in collaborating with us.