he asks."We speak all languages here," Luna smiles. "We use mind power. But we have a big problem, Ben."Luna takes Ben to her village. The houses look like glass bubbles. But the village is dark. The people are sad."Our planet needs energy," Luna explains. "We have a big machine, the Star Heart. It gives light and warmth to our world. But three days ago, the Star Heart lost its power. Now our planet is cold and dark. We need the Magic Green Stone to start the machine again."Ben remembers the stone in his pocket. He takes it out. The stone glows very brightly now. The villagers look at the stone and smile. The Star HeartLuna takes Ben to a big glass tower. In the center of the tower, there is a giant mechanical heart. It is grey and cold."Put the stone inside," Luna says.Ben walks to the machine. He puts the green stone into a small hole in the Star Heart. For one second, nothing happens. Ben holds his breath.Then, BOOM! A giant flash of light fills the tower. The light travels out into the village and across the whole planet. The sky becomes beautiful, the houses glow, and the people shout with joy."