• 32 Videos, Slides, Films

• 28 Stars
• 27 Galaxies
• 19 Astronomy
• 3 Physics
• 3 Space flight
• 2 Biology
• 2 Discoveries in science
• 2 Exploration
• 2 History
• 2 Quantum theory
• 2 Space environment
• 2 Space vehicle accidents
• 2 Study and teaching
• 1 Accidents
• 1 Aerodynamics
• 1 Aeronautics
• 1 Aeronautics and civilization
• 1 Aerospace industries
• 1 Asteroids
• 1 Astronomical geography
• 1 Biosphere
• 1 Black holes (Astronomy)
• 1 Challenger (Spacecraft)
• 1 Collisions (Astrophysics)
• 1 Collisions with Earth

• 32 Films Media Group
• 32 Films for the Humanities & Sciences (Firm)
• 6 Cambridge Educational (Firm)
• 2 ABC International
• 1 4 Learning (Firm)
• 1 A&E Television Networks, LLC
• 1 Allegro Productions (Firm)
• 1 American Museum of Natural History
• 1 BBC Worldwide Ltd
• 1 Infobase
• 1 Public Broadcasting Service (U.S.)
• 1 Scorpion TV

• 32 English

• 1 Mars (Planet)
• 1 Solar system
• 1 United States

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