• 30 Videos, Slides, Films

• 11 DVDs

• 22 Astronomy
• 11 Evolution
• 5 Biology
• 5 Ecology
• 4 Human ecology
• 3 Discoveries in science
• 3 Geology
• 3 Space and time
• 2 Astronomical observatories
• 2 Copernicus, Nicolaus, 1473-1543
• 2 Exploration
• 2 Galaxies
• 2 Galilei, Galileo, 1564-1642
• 2 Hawking, Stephen, 1942-2018
• 2 History
• 2 Origin
• 2 Physics
• 2 Space telescopes
• 2 Telescopes
• 1 Agricultural ecology
• 1 Amyotrophic lateral sclerosis
• 1 Atmospheres
• 1 Black holes (Astronomy)
• 1 Cities and towns

• 19 Independent Communications Associates
• 19 Kennard, David
• 19 Music Video Distributors, Inc.
• 19 Northcutt Productions
• 19 Northcutt, Patsy
• 19 Swimme, Brian
• 19 Tucker, Mary Evelyn
• 19 Yale University. School of Forestry and Environmental Studies
• 3 Hawking, Stephen, 1942-2018
• 3 Public Broadcasting Service (U.S.)
• 3 Tyson, Neil deGrasse
• 2 DeNooyer, Rushmore
• 2 Goldsmith, Donald
• 2 Greene, Brian, 1963-
• 2 Interstellar Studios
• 2 Koenig, Kris
• 2 London Symphony Orchestra
• 2 PBS Distribution (Firm)
• 2 PBS Home Video
• 2 Pereira, Frank L
• 2 Science Channel (Television network)
• 2 Slater, Mark
• 2 Van Helden, Albert
• 1 2 Entertain Video (Firm)
• 1 32-12 Media (Firm)

• 30 English

• 21 Universe
• 20 Earth (Planet)
• 3 Solar system
• 2 Outer space
• 1 California
• 1 Deep space
• 1 Milky Way
• 1 Palomar, Mount
• 1 United States

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