Reading Metrics
Grade Level
Middle Grades (MG 4-8)
Book Level
7.9
Points
1.0
Fiction/Nonfiction
Nonfiction
Word Count
8090
Points per Word
0.000124
Page Count
64
Points per Page
0.015625
Series
Mystery Explorers
Description
What are UFOs? Are they military aircraft, tricks of the light, or alien spacecrafts visiting Earth? For hundreds of years, people have been trying to make sense of many UFO sightings. The coauthor is Janet I. Stirling.