The question of whether the universe is eternal is a topic of debate and speculation among scientists, philosophers, and theologians. there is no definitive answer to this question.
In the scientific realm, the prevailing understanding is that the universe had a beginning, known as the Big Bang, which occurred approximately 13.8 billion years ago. According to the Big Bang theory, the universe expanded and evolved from an extremely hot and dense state. This theory is supported by a wide range of observational evidence, such as the cosmic microwave background radiation and the observed expansion of the universe.
However, the concept of the universe's "eternity" can be interpreted in different ways. Some propose the idea of cyclical universes, where the current universe undergoes cycles of expansion and contraction, leading to a series of Big Bangs and subsequent "Big Crunches." This theory suggests that the universe could be part of an eternal cycle, with no definitive beginning or end.
Other theories, such as the concept of a multiverse, posit that our universe is just one of many universes existing simultaneously. In this view, the multiverse could be eternal, with new universes constantly being formed.
It's important to note that these ideas are still speculative and subject to ongoing scientific investigation and theoretical development. The nature of the universe's origin and potential eternity remains an active area of research, and future discoveries may shed further light on this fascinating question.