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Vela satellite comparison table
Subject is a kind of has altitude has definition
military spacecraftartificial satellite  
Vela satellitemilitary spacecraft120000 kmA sequence of satellites launched to monitor possible violations of the nuclear test ban treaties. The system consists of four satellites in a circular orbit around the Earth with a radius of 120000 km. The Vela satellites have detected cosmic gamma-ray bursts (q.v.).

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