How are galaxies defined? What do supernovas send out? What was the environment like on early earth? How many years do s

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How are galaxies defined? What do supernovas send out? What was the environment like on early earth? How many years do s

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How are galaxies defined?
What do supernovas send out?
What was the environment like on earlyearth?
How many years do scientists think have passed betweenthe Big Bang and the appearance of humans?
What is the significance of zooming out and in by powersof 10?
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