6Explore the dark side of space in Out of this World, a new and exciting series for struggling readers. What are the four different types of black holes? What's inside a black hole? These and other fascinating questions are discussed in the Black Holes title using considerate text that is written at a higher maturity level with a lower reading level to engage struggling readers. A table of contents, glossary with simplified pronunciations, and index all enhance reading comprehension. Sidebars include hands-on experiments, spotlight biographies on women in science, tech connections, and far out facts.