UFO sightings have fascinated and puzzled people for decades, and the search for extraterrestrial life and advanced civilizations remains one of the most intriguing scientific quests. While many UFO sightings can be explained as natural phenomena, hoaxes, or misperceptions, some cases defy conventional explanations and suggest the possibility of extraterrestrial visitors. One of the most intriguing questions is where do UFOs come from and how do they travel such vast distances in space? Another question is whether space portals, wormholes, or other shortcuts through space-time could exist and be used by UFOs or advanced civilizations. In this article, we will explore some of the explanations and theories from the 90s that attempted to answer these questions.

The 90s were a period of renewed interest in UFOs and space exploration, fueled by the end of the Cold War, the discovery of exoplanets, and the rise of the internet and digital media. Many people, including scientists, writers, and enthusiasts, shared their ideas and evidence about UFOs and their origins, some of which were controversial, speculative, or sensational. Nevertheless, these ideas reflect the human imagination and curiosity about the unknown, and some of them have inspired further research and debate.

One of the most popular explanations for UFOs in the 90s was the extraterrestrial hypothesis (ETH), which posits that UFOs are piloted by intelligent beings from other planets or star systems. Proponents of the ETH argue that the vastness of the universe and the abundance of habitable worlds make it likely that some of them have evolved advanced life forms that could develop the technology to travel to Earth. They also point to the numerous eyewitness accounts, photos, and videos of UFOs that suggest they exhibit behavior and features that defy conventional aircraft or natural phenomena. However, critics of the ETH question the lack of concrete evidence, the implausibility of interstellar travel, and the potential flaws in eyewitness testimony and perception.

Another explanation for UFOs in the 90s was the secret military technology hypothesis (SMT), which suggests that some UFOs are actually advanced aircraft or drones developed by secret government agencies or private corporations. Proponents of the SMT argue that many UFO sightings occur near military bases or testing sites, and that some of the reported features of UFOs, such as silent propulsion or high maneuverability, could be explained by classified technologies. They also point to the history of military secrecy and cover-ups regarding UFO sightings and crashes, such as the Roswell incident of 1947. However, critics of the SMT question the lack of direct evidence or whistleblowers, the feasibility of concealing such advanced technology for decades, and the motivation for deploying it in civilian areas.

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A third explanation for UFOs in the 90s was the interdimensional or extradimensional hypothesis (IDH or EDH), which suggests that UFOs are not physical objects but rather manifestations of beings or entities from other dimensions or parallel universes. Proponents of the IDH or EDH argue that some UFOs exhibit properties that defy the laws of physics or biology, such as disappearing or morphing, changing colors or shapes, or emitting radiation or energy fields. They also point to the similarities between UFO encounters and paranormal or psychic phenomena, such as telepathy or time slips. However, critics of the IDH or EDH question the lack of empirical evidence or testable predictions, the reliance on metaphysical or pseudoscientific concepts, and the potential for confounding factors such as mental illness or hallucinogenic substances.

In addition to these explanations for UFOs, some researchers and writers in the 90s also speculated about the possibility of space portals

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