Biology, 03.12.2020 19:50, ncontreras06

The universe began in an incredibly hot and dense state about 13.8 billion years ago. Since this time, it has been rapidly expanding, causing galaxies to move away from one another. Energy in the coldest depths of space can be explained as radiation left behind from the universe's early, more energetic state.

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The universe began in an incredibly hot and dense state about 13.8 billion years ago. Since this tim...