in very good condition - very thick heavy book hardcover 
In the tradition of DK's acclaimed Children's Encyclopedia series, the DK Space Encyclopedia is a comprehensive school, library, and home reference to the fascinating world of space, from strange phenomena like black holes to the latest stunning images from the Hubble Telescope. Covering cosmology, astrophysics, astronomy, and space exploration, the book's clear, informative text and thousands of photos, graphics, cross sections, maps, and charts give children age 8 and up absorbing, unparalleled view of our universe.