Star Challengers: Asteroid Crisis: Asteroid Crisis

From two New York Times–bestselling authors, a group of young people go to the International Space Station on a mission to save earth from alien invasion.

It was supposed to be just 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 under siege from deadly alien invaders. The evil Kylarn have shifted the orbits of three asteroids, sending them tumbling toward Earth—and a dire...