• 27 Stars
• 19 Astronomy
• 3 Physics
• 2 Discoveries in science
• 2 History
• 2 Quantum theory
• 2 Space environment
• 2 Study and teaching
• 1 Asteroids
• 1 Astronomical geography
• 1 Biology
• 1 Biosphere
• 1 Black holes (Astronomy)
• 1 Collisions (Astrophysics)
• 1 Collisions with Earth
• 1 Cosmic rays
• 1 Dark matter (Astronomy)
• 1 Disasters
• 1 Dynamics
• 1 Earth sciences
• 1 Ecology
• 1 Ecosystem management
• 1 End of the world (Astronomy)
• 1 Environmental aspects

• 28 Films Media Group
• 6 Cambridge Educational (Firm)
• 2 Infobase
• 2 Public Broadcasting Service (U.S.)
• 1 4 Learning (Firm)
• 1 Allegro Productions (Firm)
• 1 American Museum of Natural History
• 1 BBC Worldwide Ltd
• 1 Scorpion TV

• 28 English

• 27 Outer space
• 1 Solar system
• 1 United States

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