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Cosmic ray astronomy satellite
 | N-4 Russian cosmic ray astronomy satellite. Designated Proton 1 after launch; investigated ultra-high-energy cosmic particles. |
 | N-6 Russian cosmic ray astronomy satellite. Proton 4. Cosmic ray measurements. Study of the nature of high and ultra-high energy cosmic rays and their interaction with atomic nuclei. Mass announced at time of launch 17,000 kg. |
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