June Scobee Rodgers Presents Star Challengers Book 3: Asteroid Crisis It's just supposed to be an educational field trip to the Challenger Learning Center, but JJ Wren and her friends find themselves transported into the future, to a time when the human race is besieged by deadly alien invaders. The evil Kylarn have shifted the orbits of three asteroids, sending them on a collision course with Earth! Using skills learned from the mysterious Commander Zota, JJ and her fellow Star Challengers embark on a mission to deflect the deadly asteroids before it's too late. But the alien invaders aren't the only enemy: the Star Challengers have to worry about human traitors, too. . . .