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The concept of aliens, or extraterrestrial beings, has fascinated humans for millennia, appearing in myths, religions, and science fiction. However, the scientific study of aliens only began in the 20th century, with the development of astronomy, astrobiology, and SETI (the search for extraterrestrial intelligence). Despite various claims of sightings, abductions, and encounters, no firm evidence of alien existence has been found yet, but the possibility remains open and the curiosity persists.

In ancient civilizations, aliens often played the role of gods or messengers from above. For example, the Sumerians of Mesopotamia depicted their deities as beings with wings, horns, and eyes all over their bodies, who descended from the sky in flying vehicles called "vimanas." The Egyptians portrayed their gods as human-like, but with animal heads, such as Anubis, the jackal-headed god of the dead. The Greeks told stories of gods who visited Earth in various forms, such as Zeus, who impregnated mortal women, or Athena, who sprang fully formed from the head of Zeus. The Romans merged their own pantheon with that of the Greeks, adding some new ones like Mithras, a sun god who may have originated in Persia. These myths and legends reflected the human desire to explain the mysteries of nature, life, and death, as well as the fear and awe of the unknown.

During the Age of Exploration (15th-17th centuries), Europeans began to discover new lands and peoples beyond their own continent. Some of them imagined that these strangers might be aliens, especially when they encountered cultures vastly different from theirs, such as the Aztecs and the Incas in America, or the Samurai and the Geishas in Japan. Some even speculated that these peoples might be descended from aliens who had colonized Earth long ago, or that they might possess advanced knowledge or technology that could benefit or threaten humanity. However, such ideas did not gain much scientific support or attention, as most Europeans saw themselves as the center of the world and the only civilized race.

The birth of modern astronomy in the 17th century, with the works of Copernicus, Galileo, and Newton, challenged the traditional belief that Earth was the center of the universe and everything else revolved around it. Instead, they proposed a heliocentric model, in which the Sun was the center and the planets orbited around it. This opened up a new vista of the cosmos, and enabled astronomers to measure the distances, sizes, and motions of celestial objects more accurately. However, it also raised the question of whether other stars and planets might host life, and if so, how it would look like and how it would influence the universe.

In 1835, French astronomer Jules Verne published a novel called "From the Earth to the Moon," which imagined a group of people traveling to the Moon in a giant cannon fired from Earth. This was one of the earliest examples of science fiction, a genre that became popular in the 19th and 20th centuries, and explored various aspects of alien life and encounters. Some of the most famous works in this genre include H.G. Wells' "The War of the Worlds," which described a Martian invasion of Earth, and Arthur C. Clarke's "2001: A Space Odyssey," which depicted an encounter with an alien artifact that transformed human consciousness. These stories inspired and entertained generations of readers and viewers, and contributed to the public interest in space exploration and SETI.

In the 20th century, the development of radio and radar technology facilitated the search for extraterrestrial signals. In 1960, Frank Drake conducted the first systematic search for radio signals from other stars, using a radio telescope in Green Bank, West Virginia. He formulated an equation called the Drake Equation, which estimated the number of detectable civilizations in the Milky Way galaxy based on several factors, such as the rate of star formation, the fraction of stars with planets, the probability of life arising on a planet, the likelihood of intelligent life evolving, and the duration of their existence. This equation became a standard tool for SETI researchers, who scanned the skies for narrowband signals that might indicate a deliberate transmission from an alien civilization. However, despite many false alarms and promising candidates, no confirmed signal has been received yet.

Apart from radio signals, other approaches to SETI include optical and infrared searches, which look for artificial signatures in the spectra of stars and planets, such as traces of pollution, industrial emissions, or artificial lighting. Some scientists also study the atmospheres of exoplanets, which might reveal the presence of oxygen, water vapor, methane, or other compounds that are associated with life on Earth. However, these methods are still in their infancy and face many challenges, such as the difficulty of distinguishing natural phenomena from artificial signals, the limited resources available for such searches, and the ethical and legal issues of interacting with alien beings, if they exist.

Meanwhile, some researchers have proposed different hypotheses and models of alien life, ranging from primitive cells to intelligent machines. They have also explored the implications of different scenarios of alien contact, ranging from peaceful communication to hostile invasion. Some of the most debated questions in this field include the Fermi paradox, which asks why, given the vastness of the universe and the abundance of potentially habitable worlds, we have not yet encountered any alien species, and the zoo hypothesis, which suggests that aliens are aware of us but choose not to reveal themselves, for various reasons.

Overall, the history of aliens reflects the human journey of curiosity, imagination, and exploration, as well as the scientific and philosophical challenges of understanding our place in the universe. Whether or not we ever discover or encounter aliens, the quest for alien life and intelligence will continue to inspire and challenge us to expand our knowledge and perspectives.