Fill in the Blanks Lesson 1.8: Fill in the Blanks: The Origin of the UniverseOnline version Test your knowledge about the Big Bang theory and cosmic phenomena! by Eric D Norman 1 away cooled expanding cosmic microwave background hot closer blue shifts origin shorter small closer Big Bang longer universe red shifts expanded theory Big Bang The is the leading explanation for the of the , suggesting that it began as an extremely and point approximately 13 . 8 billion years ago . As the universe , it , leading to the formation of subatomic particles and later simple atoms . The ( CMB ) radiation is a crucial piece of evidence supporting the Big Bang Theory ; it is leftover from the , filling the universe and providing a snapshot of the early universe . Suggesting that the early universe was together and hotter . Additionally , and observed in distant galaxies indicate that the universe is . Red shifts occur when objects move from us , causing their light to stretch into wavelengths , while blue shifts happen when objects move , compressing their light into wavelengths . Together , these phenomena help astronomers understand the dynamics of the universe and its evolution from a singularity to the vast cosmos we observe today .
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