Did you know most stuff in space is invisible?! In this book, find out how we explore space, even the invisible bits like black holes. This title is for readers aged 7 to 11 years old. There's a Black Hole in this Book is at Oxford Reading Level 8. It is for pupils who are working below expected standard in their reading. The Readerful Rise series ensures that older struggling readers have books with age-appropriate content and topics, that look like the books their peers are enjoying, but are written at a level they can read successfully.