Which statement about the Big Bang Theory is true?

The Big Bang Theory is fundamentally significant in cosmology because it describes the origin of the universe and explains several observations about its current state. The assertion that the theory predicted an expanding universe is rooted in the observations made by astronomers such as Edwin Hubble, who discovered that galaxies are moving away from each other. This observation is consistent with the predictions of the Big Bang Theory, which suggests that the universe has been expanding since its inception as a hot, dense state. The model not only describes this expansion but also indicates that it is a key characteristic of the universe's evolution following the initial singularity.

While the idea of an expanding universe is widely accepted in the scientific community, it is important to note that acceptance can vary based on ongoing research and new discoveries. The theory was not directly proposed by Einstein, as it was first rooted in the work of Georges Lemaître and later supported through Einstein's equations of general relativity. Additionally, the Big Bang Theory does not support a static universe; rather, it fundamentally contradicts that notion by demonstrating that the universe is dynamic, evolving over time. Thus, the correct statement regarding the Big Bang Theory relates to its prediction of an expanding universe, emphasizing its role in understanding the cosmos.