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physical object > artifact > device > instrument > artificial satellite > military spacecraft |
military spacecraft comparison table |
Subject | has altitude | has definition |
---|---|---|
DMSP satellite | ||
reconnaissance spacecraft | ||
Vela satellite | 120000 km | A 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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