Mars gets a full visual treatment in Mars: Explore the Mysteries of the Red Planet, which covers how the planet formed and what missions have found on its surface.
Shauna Edson and Giles Sparrow write for young readers without softening the science, taking in the evidence relating to ancient water, the rovers and orbiters sent to study the terrain, the question of whether life ever existed there and what a crewed mission would involve. Photographs returned by missions, diagrams and illustration carry much of the content, and the text is careful to mark what is known apart from what is still being investigated.
What the format offers:
• Planetary formation and surface features explained for younger readers
• Mission findings, including the evidence relating to ancient water
• Open questions about past life handled as ongoing inquiry
• Mission photography and diagrams used throughout
A strong pick for space-interested children, school projects and family reading, published by DK and available at Boipoka.