Watching the Cosmic Party While It Lasts!

• The Universe, if it had started with density fluctuations a hundred times weaker, would have been filled with a nearly homogeneous gas of mostly hydrogen atoms, cold and rarefied, with no galaxies, stars, or life.
• The actual Universe we inhabit has deviations from the mean density that were initially one part in a hundred thousand, leading to the formation of structures and the emergence of life.

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