Elementary schoolers Jet and Jordy live and breathe the world of space science, especially when it comes to understanding and constructing homemade working rovers and rockets. If there's a challenge to be solved, this sister and brother figure it out, even if it means that Jet's rover is destroyed by the rocket that Jordy accidentally sends crashing through her bedroom window! When they decide to combine their talents and work as a team, big things start to happen. Their contagious energy, boundless curiosity, and dedication to problem-solving (with some help from a math-minded snake, a nimble frog, and some bubble gum), lead the duo to a NASA contest with an out-of-this-world prize they could have never imagined. Parents, teachers, and young readers will delight in being along for the ride as Jet and Jordy discover the sky is definitely not the limit!