Pack-inserted entry blanks for a “$150,000 Space Trivia Challenge” enticed both young and adult collectors to read the card backs and answer 25 space flight history questions,[3] with entry blanks being sent by mail to those interested.[4] The first 100 people to submit correct answers to 100 trivia questions posed on the first four series of cards were to receive a $1,500 scholarship.[2][5]
The original promo sheet for the first series featured an uncut card sheet of six different card images and featured the pre-printed signatures of Lovell, Cernan, and Pete Conrad.[6]
The first collectors' edition of 25,000 sets of 110 cards sold out in 10 months.[2]
The promo card for the second 110-card series was an uncut six-card sheet signed by Lovell, Bruce McCandless, and cosmonaut Vladimir Dzhanibekov.[6] The series of 100,000 sets was issued in 1991 and was sold for $18[2] in card shops and by mail.[7]
The promo sheet for the third series, entitled the International Edition, featured a packet of nine cards handsigned by Lovell, Dzhanibekov, and Buzz Aldrin. Most of the astronauts and cosmonauts eventually left the project.[6]
A special edition set, the fourth released, was called "Moon/Mars". This series retailed for $30.[8]
The cards were embraced by the National Education Association.[9]