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Why Do We Have Night and Day?
häftad,
2015,
Engelska,
ISBN 9781499408508
This title explores the relationship between Earth and the Sun. Readers will learn how and why Earth orbits the Sun, as well as the materials that make up the Sun. Readers will …
What Does Gravity Do?
häftad,
2015,
Engelska,
ISBN 9781499408560
What is gravity and how does it work? Could Earth ever stop spinning, and what would happen if it did? How do astronauts prepare for a life with zero gravity? This book introduces …