The Encyclopaedia Britannica Interactive Science Book: Space is an 80-page, brilliantly illustrated book for people of all ages designed for use with the SD-X Interactive Reader (sold separately). The book is part of a six-book library. The books are available separately and also are sold in sets of three and a set of six.The SD-X Interactive Reader is a battery-powered pen that reads text on the book pages and also offers audio content such as facts and sound effects. The Reader works only with the six Encyclopaedia Britannica Interactive Science Library books. Each book has two hours of audio content.The Encyclopaedia Britannica Interactive Science Book: Space covers the world beyond Earth's atmosphere from multiple perspectives, with chapters on space exploration, the solar system, and beyond the solar system. From early rockets to space shuttles and beyond, from solar winds to astronauts, from colorful looks at every planet to the deepest theories of cosmogony—the book provides a detailed look into space with scientific insight and entertaining data, all accessible in an enhanced format using the SD-X Interactive Reader. - from Amzon