UPCAT Earth Science 2025 – 400 Free Practice Questions to Pass the Exam

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What happens after the initial cataclysmic explosion according to the Big Bang Theory?

Immediate formation of planetary bodies

An expansion and cooling of the universe

According to the Big Bang Theory, after the initial cataclysmic explosion, the universe underwent a rapid expansion and subsequent cooling. This expansion is a fundamental aspect of the theory, describing how the universe has been stretching from an extremely hot, dense state into the vast cosmos we observe today. As the universe expanded, it began to cool, leading to the formation of the simplest elements like hydrogen and helium.

The cooling allowed for the eventual formation of the first stars and galaxies after many millions of years. Thus, the scenario described by the correct choice highlights the essential processes that occurred shortly after the Big Bang, marking the transition from an initially hot, dense condition to a cooler, expanding universe where structures began to form. This description gives a clear understanding of the early universe's dynamics critical to the Big Bang Theory.

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A rapid increase in solar activity

The formation of black holes

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