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- Proton (satellites)
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Environmental Research Satellite
Entity
SECOR
Entity
Pioneer 6, 7, 8, and 9
Entity
Baikonur Cosmodrome Site 81
Entity
Gravity Gradient Technology Satellite
Entity
Russian
Entity
astronomy
Entity
Soviet Union
Concept
Indian Ocean
Entity
proton
Entity
quark
Entity
Lomonosov Moscow State University
Entity
gamma ray
Entity
hertz
Entity
Sputnik 1
Entity
Sergei Korolev
Entity
electronvolt
Entity
orbital period
Entity
OCLC, Inc.
Entity
apsis
Entity