What makes stars shine? Which planet would float in water? And have aliens ever visited Earth?Discover the scientific answers to these questions and more in this astounding book, which is overflowing with out-of-this-world facts about our solar system, galaxy, and Universe. Perfect for readers aged 7+. ABOUT THE SERIES: Big Ideas! is a dynamic, high-energy fun fact series for children aged seven and up, illustrated throughout with humorous cartoons. Packed with surprising facts, stats, and records that kids will just love to share, it revels in all things weird, unexpected, mind-blowing, funny, and gross! This series really has the wow factor. It's like a roller-coaster ride for your brain!