Just after learning that Earth's scientists no longer consider him a planet, an unhappy Pluto takes a visitor from Earth on a tour of the solar system, sharing facts along the way.

Stella loves the wonders of Outer Space, but it is only when she meets a fellow space traveler looking for a planet that her eyes are opened to the wonders of Earth.

"Helen and Tim journey here, there and everywhere through our majestic solar system. They soar past the cold rocky surface of Mars as it rises into towering peaks and plunges into deep canyons and glide through a bumpy asteroid belt made of icy rocks. They blast deeper into our solar system, exploring the dazzling stars and astounding planets along the way. But now it really is time to head home! As the rocket speeds towards Earth, Tim and Helen watch...