Where is Mars? -- How big is Mars? -- What does Mars look like? -- What makes up Mars? -- What is Mars' atmosphere like? -- Has the Atmosphere of Mars changed over time? -- What is the weather on Mars? -- How does Mars compare with Earth? -- What are the orbit and rotation of Mars like? -- What is the surface of Mars like? -- What is the largest canyon system on Mars? -- What is the largest volcano on Mars? -- What is the largest crater on Mars? -- Does Mars have rivers? -- What are the Martian poles like? -- Does Mars have seasons? -- How much water is on Mars today? -- Does Mars have a face? -- Are there pieces of Mars on Earth? -- How many moons does Mars have? -- Was Mars ever like Earth? -- What were some early ideas about Mars? -- How did Mars get its name? -- Where is Mars in the night sky? -- What space missions have studied Mars? -- Will astronauts ever visit Mars? -- Will people ever colonize Mars? -- Could there be life on Mars? -- Fun facts about Mars -- Glossary -- Index and resource list.