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According to this passage ...

It may be inferred that ...

The sentence below that best summarizes this passage is ...

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According to this passage ...

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Reading Skill ASTRONOMY

A popular theory explaining the evolution of the universe is known as the Big Bang Model. According to the model, at some time between ten and twenty billion years ago, all present matter and energy were compressed into a small ball only a few kilometers in diameter.

Another word which is often used in place of compressed is ______.

Then, at a moment in time that astronomers refer to as T = 0, the ball exploded, hurling the energy into space. Expansion occurred. As the energy cooled, most of it became matter in the form of protons, neutrons, and electrons. These original particles combined to 1on hydrogen and helium, and continued to expand. Matter formed into galaxies with stars and planets.

According to this passage, when were the galaxies formed?

A popular theory explaining the evolution of the universe is known as the Big Bang Model. According to the model, at some time between ten and twenty billion years ago, all present matter and energy were compressed into a small ball only a few kilometers in diameter. It was, in effect, an atom that contained in the form of pure energy all of the components of the entire universe. Then, at a moment in time that astronomers refer to as T = 0, the ball exploded, hurling the energy into space. Expansion occurred. As the energy cooled, most of it became matter in the form of protons, neutrons, and electrons. These original particles combined to 1on hydrogen and helium, and continued to expand. Matter formed into galaxies with stars and planets.

The sentence below that best summarizes this passage is ______.