The universe began

The event which began the universe was the

A star moving away from Earth has a spectrum that is

Energy from collision and pressure from gravity caused the center of the solar nebula to become

What is a galaxy?

What type of galaxy is the Milky Way?

What is a light year?

What is important about Hubble's discovery that there is red shift in the spectra of galaxies?

What makes up most of our universe?

The solar system formed from

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