These Hi-Lo dual-banded books combine lower reading levels with age-related interest levels. The first 24 books are highly decodable (Stars to Earth) and are ideal for phonics practice and revision and include letter-sounds and tricky words lists, as well as questions designed to improve vocabulary and comprehension. The additional 24 books are Hi Interest-Low Reading Level dual-banded (Mars to Supernova).

Astro also includes a range of fun mini series for children to follow as they progress with their reading. Each series includes four books with a story per book band. From deadly dragons to spooky schools, there's a series for every reader to enjoy!