AR Book Level
3.3
AR Points
0.5
Word Count
2,333
Interest Level
Middle Grades (MG 4-8)
Genre
Nonfiction
AR Quiz #
316261 EN
About this book
Have you ever seen something in the sky that you could not explain? UFOs have been sighted by many people. No one has yet explained what they are or where they come from. Are we really alone in the Universe? This book helps you make up your own mind.