Whether it's a science fiction novel or a science fiction movie, one of the most captivating concepts is time and space travel. According to common sense, everything always progresses toward the future, regardless of the speed or pace at which time passes—there is only one direction.

As avid science fiction fans, many people dream of the ability to travel through time and space. Some long to journey into the past, while others yearn for a glimpse into the future.

The future is an uncertain realm, yet traveling to the future is theoretically plausible. If we could pilot a spacecraft at speeds approaching that of light or orbit a black hole at close proximity, slowing down time within our spatial-temporal vicinity, we could theoretically embark on a voyage to the future.

The theory of parallel universes was first introduced by German physicist Erwin Sheridan in 1957. Sheridan proposed the concept of "multiverses," which was further refined by American physicists Hugh Everett and Richard Feynman.

According to their theories, parallel universes coexist as distinct multiverses, each with its own independent time, space, and physical laws. These universes exist in isolation, devoid of any interconnection. This concept of multiple universes is commonly referred to as the multiverse theory.

Parallel universes bear similarities to our own reality, yet they also exhibit profound differences. Each parallel universe possesses its own unique rules and characteristics, potentially featuring diverse laws of physics, distinct historical development trajectories, and even disparate life forms.

Imagine a parallel universe where dinosaurs never faced extinction on Earth or where humans never invented electronic technology, resulting in an entirely distinct technological advancement. Such scenarios are plausible within parallel universes.

Originally, "parallel universes" denoted universes where only parallel forces existed. However, in science fiction, a parallel universe represents an alternate timeline generated by a "time paradox," rather than an actual universe.

It is important to note that the parallel universe in physics differs from its depiction in science fiction. The real concept of a parallel universe is grounded in rigorous scientific theory—a reasonable inference made by scientists based on existing data and observed facts.

So, how can we prove the existence of parallel universes? While scientists have not directly observed parallel universes, there are theoretical and experimental indications supporting this concept.

For instance, phenomena such as quantum superposition and quantum entanglement demonstrate that microscopic particles can exist in multiple states simultaneously, serving as indirect evidence for the existence of parallel universes.

Additionally, observations of cosmic background radiation offer some support for the multiverse theory, as they may result from interactions between different parallel universes.

Parallel universes extend beyond mere scientific concepts; they have also captured the imagination of artists in various forms such as literature and movies. Numerous science fiction works depict human voyages to parallel universes, exploring the unfamiliar and enigmatic nature of these alternative realities.

The concept of time and space travel, particularly the exploration of parallel universes, continues to enthrall science fiction enthusiasts. While the existence of parallel universes remains unproven, scientific theories and experimental evidence offer compelling arguments in support of their plausibility.

These intriguing realms, whether in the realm of physics or the realm of imagination, beckon us to contemplate the infinite possibilities that lie beyond our own universe.