Cover: Extraterrestrial: Past, Present, and Future
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Extraterrestrial: Past, Present, and Future

From the Set 21st Century Skills Library

Our solar system is more than six billion years old. Scientists believe there was life on Mars four million years ago. Many people on Earth believe they are the only life forms in the universe but, with millions of undiscovered planets out there, can that really be true? Find out how life began on Earth, how far humans have come in a short period of time, and how we might measure up to other worlds. Includes 21st Century Skills and Content, sidebars, activity, table of contents, index, and glossary.

Interest Level Grade 4 - Grade 8
Reading Level Grade 5
Number of Pages 32
Dimensions 7 x 9


Available Formats Reinforced book (9781668909850), Paperback (9781668911457), PDF (9781668914632), ePub (9781668913048), Hosted ebook (9781668917817), Kindle (9781668916223)
Publication Date 08/01/2022
Graphics Full-color photographs
Language English
Copyright 2023
Dewey 576.8/39
Lexile 820L