For thousands of years, humans have wondered whether there is life in outer space. In more recent years, people have searched for evidence. Are there signs of alien life? Read more to find out!
Chapter 1 - Are We Alone?
Chapter 2 - The Search For Alien Life
Chapter 3 - Aliens On Earth
Chapter 4 - Where Are The Aliens?
Glossary
Trivia
Activity
Further Resources
Index