Figure 4-7 
-Refer to Figure 4-7.The shift from Db to Da is called
Definitions:
Solar System
The Sun, its eight planets, and other celestial bodies that orbit the Sun.
Asteroids
Small rocky bodies orbiting the sun, primarily found in the asteroid belt between Mars and Jupiter.
Gravity
Gravity is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward (or gravitate toward) one another.
Tides
The periodic rise and fall of sea levels caused by the gravitational attraction of the moon and the sun acting upon the earth.
Q84: Adam Smith suggested that an invisible had
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