2Erin, Mateo, and Noel started the Star Gazers to uncover the truth about life beyond the stars. Convinced that Earth is being visited by extraterrestrial travelers, they investigate a series of top secret files originating from Nellis Air Force Base, which happens to be where Erin's mother works. Learning about the Advanced Aviation Threat Identification Program leads the kids to an underground training facility where they become trapped in a UFO bound for Europa, one of Jupiter's many moons. This graphic novel series includes STEM-focused sidebars and callouts, activity, character profiles, original illustrations, table of contents, glossary, and index.