JEM-EUSO ("Extreme Universe Space Observatory") is a Space Mission devoted to the scientific research of cosmic rays of highest energies. Its super-wide-field telescope looks down from the International Space Station
onto the night sky to detect UV photons emitted from air showers generated by UHECRs in the atmosphere.
Every 90 minutes, the detector will orbit the Earth at an altitude of approximately 400 km and reproduce the space development of an air shower with very high precision, measuring accurately its positions and energy.