Join Jet Propulsion and his friends as they explore the solar system in this Level 2 Ready-to-Read based on a popular episode of PBS’s hit show Ready Jet Go ! Why do stars twinkle in the sky, but planets don’t? Jet, Sydney, and Sean are about to find out during the best sleepover ever! This Level 2 Ready-to-Read includes bonus back matter content with lots of fun facts about stars! © Copyright 2018 Jet Propulsion, LLC. Ready Jet Go! is a registered trademark of Jet Propulsion, LLC.