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Middle school timeline of the Big Bang Theory __________.

Options:
A) With key events
B) Illustrated
C) Interactive
D) Focused on Earth

1 Answer

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Final answer:

The Big Bang Theory explains the origin and evolution of the universe. Here is a middle school timeline of key events, from the Big Bang to the appearance of humans on Earth.

Step-by-step explanation:

The Big Bang Theory is a scientific explanation for the origin and evolution of the universe. It states that the universe began as a singularity, a point of infinite density and temperature, approximately 13.8 billion years ago. Here is a middle school timeline of the Big Bang Theory with key events:

13.8 billion years ago: The universe begins with the Big Bang.

380,000 years after the Big Bang: The universe cools down enough for protons and electrons to combine, forming neutral hydrogen and helium atoms.

600 million years after the Big Bang: First galaxies and stars begin to form.

9 billion years after the Big Bang: Our Sun and Solar System form from a collapsing molecular cloud.

4.5 billion years ago: Earth forms as part of the Solar System.

3.5 billion years ago: Life appears on Earth in the form of simple single-celled organisms.

200,000 years ago: Homo sapiens, modern humans, evolve and begin to populate the Earth.

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