Reading Metrics
Grade Level
Middle Grades (MG 4-8)
Book Level
6.6
Points
1.0
Fiction/Nonfiction
Nonfiction
Word Count
3541
Points per Word
0.000282
Page Count
32
Points per Page
0.03125
Description
This edition, revised and updated by Richard Hantula, provides an up-to-the-minute examination of the development of our planetary system from the birth of the Sun, to the building of the planets, to speculation about when the Sun might die out.