This is one of a series in which each book contains flaps and fold-outs, and is accompanied by a sheet of reusable stickers. Readers can turn a disc to see which stars are in view on a particular day of the year, and how travellers once used the positions of the stars to find their way. The book covers the Moon - its orbit, what happens during an eclipse, and exploration - as well as the planets and all the other space bodies that make up the solar system. It also looks at the work of astronomers.