Because the time span of Earth's past is so great, geologists use the geologic time scale to show Earth's history.
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As humans migrated, they had to adapt to many different environments
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Universe: all of space and time (collectively referred to as spacetime) and their contents.
Solar System: gravitationally bound system of the Sun and the objects that orbit it, either directly or indirectly.
Galaxy: a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
Cluster: a group of stars formed closely
Constellation: a group of stars forming a recognizable pattern that is traditionally named after its apparent form or identified with a mythological figure.
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It passes through Namibia, Botswana, South Africa and Mozambique.
