Astronomy Practice Exam 2026 – Complete Preparation Guide

Question: 1 / 460

What does the Big Bang Theory explain about the universe?

It was formed through a collision of celestial bodies

It is the theory of electromagnetic radiation

It describes an explosion that caused the universe to expand

The Big Bang Theory describes the origin of the universe, positing that it began as an incredibly hot and dense singularity approximately 13.8 billion years ago. This event initiated a rapid expansion, which is often colloquially referred to as an "explosion," though it is more accurately described as the rapid stretching of space itself. The theory explains how the universe has been expanding and cooling ever since, leading to the formation of galaxies, stars, and other cosmic structures over time.

This option captures the essence of the Big Bang Theory by emphasizing the significant expansion that followed the initial state of the universe. The evidence supporting this theory, such as cosmic microwave background radiation and the observed redshift of distant galaxies, further validates that the universe has indeed been expanding since that initial moment.

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It refers to the life cycle of stars

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