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Stack #4585780

QuestionAnswer
when the universe began big bang/period of rapid expansion
when did the big bang happen 13.7 billion years ago
what happened after the big bang the universe rapidly expanded
after the big bang the universe was both _____ and ______ hot and dense
when did the universe become less dense and begin to cool as it expanded
a few seconds after the big bang, the protons, neutrons, and electrons started nuclear fusion
what are stars made of hydrogen and helium
first elements hydrogen and helium
low energy waves left over from the big bang all around the universe, "afterglow" heat CMBR (Cosmic Background Microwave Radiation)
Light emitted by stars is shifted to have a longer wavelength, making it shift more towards the color red. redshift
Created by: 67mustard
 

 



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