Mission to the Invisible Planet

The spaceship hummed like a giant bee as Rafi pressed the launch button for the very first time. Stars blurred past the windows as they shot through the galaxy at maximum speed. Nobody had ever found the Invisible Planet before — but Rafi had a map drawn by his grandmother, who had secretly been an astronaut, and grandmothers always knew best. The planet was invisible because it was made entirely of glass, reflecting the surrounding stars like a mirror. When...