 The projector could be controlled by a console where an individual presenter would provide specific talks or lectures . By the mid @-@ 1970s , automation features were added , which led to the creation of prerecorded shows . Most visitors to the facility would have seen an automated 40- to 45 @-@ minute audio / visual show on a particular space @-@ related topic . Two types of shows were typically alternated on a daily basis : one aimed at families with young children and another aimed at older children and adults . Typical shows aimed at both audience types were built around themes such as space travel , the mythical stories behind the constellations , and around Christmas @-@ time , a show that investigated theories on stellar explanations for the Star of Bethlehem . A listing from 1970 includes shows titled The Story of Eclipses , which looked at how solar eclipses occur and their scientific importance , Man and the Zodiac which explored the history of mythology and astrology with regard to the night sky , and The Planet Venus which surveyed the history of the planet in mythology , the planet 's motion across the sky and featured imagined views from its surface . 
