• 37 Astronomy
• 24 Outer space
• 22 Space flight
• 20 Exploration
• 14 Physics
• 10 Solar system
• 6 Energy facilities
• 6 Galaxies
• 6 Industries
• 6 Power resources
• 6 Power supply
• 6 Space
• 6 Stars
• 6 Technology
• 6 Transportation
• 5 Chemistry
• 4 Chemical elements
• 4 Chemicals
• 3 History
• 3 International relations
• 3 War
• 2 Aeronautics
• 2 Aerospace engineering
• 2 Engineering

• 53 Infobase
• 52 Films Media Group

• 3 United States
• 1 Russia (Federation)

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