1: Where does space start? 2: How fast do space rockets go? 3: What's an astronaut's job? 4: How hot is the Sun? 5: What's the weather like in space? 6: How long can a human survive in space? 7: Do astronauts really wear nappies? 8: Why do we float in space? 9: Why is Mars red? 10: How fast do comets travel? 11: Why does Saturn have rings? 12: What is an eclipse? 13: Why do stars twinkle? 14: What is space junk? 15: What is a shooting star? 16: What is the Milky Way? 17: How big is the Universe? 18: Are there really nurseries for baby stars? 19: Why can't anything escape a black hole? 20: Do aliens exist? 21: Will we live on the Moon one day? 22: Glossary 23: Find out more 24: Index.