How long ago did the Universe begin?

What was the universe like in the beginning?

What is contained in a singularity?

What evidence supports the idea tht a small point expanded to the current size of the universe?

Which color of visible light has the longest wavelength?

What does a red Doppler shift indicate about the movement of the wave source?

What happens to the length of waves in front of a moving source?

How can scientist know that the Universe was incredibly hot when it first expanded?

What is the relationship between the distance between galaxies and the speed at which they are moving apart?

What is the apparent change in wavelength of sound or light caused by motion of the source?

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