What is Extraterrestrial Life?

Extraterrestrial life generally refers to life that exists outside the Earth. This concept ranges from simple bacteria to highly intelligent aliens. The research and testing of extraterrestrial conjectures is called extraterrestrial biology or astrobiology.

Alien life

Extraterrestrial life generally refers to life that exists outside the Earth. This concept ranges from simple bacteria to highly intelligent aliens. The research and testing of extraterrestrial conjectures is called extraterrestrial biology or astrobiology.

Since the middle of the twentieth century, humans have been using methods such as detecting radio waves outside the earth and astronomical telescopes to observe potential habitable planets to detect signs of the existence of extraterrestrial life, but so far there is no definite evidence that extraterrestrial life exists. Some people think that the chance of finding aliens is small, and many people think that alien life must exist. A plethora of reports about aliens, science fiction and movies flooded rumors of alien life. ^[1]

Mars and Europa

Scientists have discovered that there may be water flowing in Mars history.

Decades after decades

Thirty-three years ago, Mars was thought to be the only planet outside of Earth that could have had a "home".

People's ideas about the life of the universe began to develop

Many of the latest detections point to "habitable zones," believing that alien life may be found there. The Viking 1 spacecraft landed on Mars in 1976 and found no obvious signs of biological activity that could support "the existence of life on Mars", and the photos of Viking 1 sent back to Earth show a desolate and cold world .

Explore directly

Scientists are directly looking for evidence of the existence of single-cell life in the solar system. The objects of study are Mars and meteorites that landed on Earth. A plan suggests that Jupiter's moons, Europa, have liquid water below their surface and may have life.

Indirect exploration

The theory proves that any technological society will spread information. But apart from humans, in general, information is not deliberately spread randomly into the depths of the universe, so other lives may not necessarily do so. And it takes a long time for signals to propagate across the vast universe. Anything that is captured or not captured is from a distant past.

Known as the most outstanding theoretical physicist Stephen Hawking after Einstein, in April 2010 in the Discovery Channel documentary "Into the Universe with Stephen Hawking", the universe has 100 billion Galaxy, "quantitatively, it is reasonable to infer the existence of extraterrestrial life." Hawking also warned that if alien creatures appear on Earth, it means that their scientific and technological capabilities are far above the Earth s humans (enough to leave far away from what Earth s humans do nt know and move to areas of the solar system). If aliens leave their original The area develops outwards, indicating that it may consume its original resources and need to explore outward; this is the risk of contact with alien creatures, which may live on large spacecraft and become nomads, crusade around And occupation of other planets may make the earth a colony.

Model reduction

Ancient alien life may have conceived on a strange exoplanet 15 million years after the universe was born. Although there was no more complicated life than microbes at that time, the concept that the universe may have specifically set for human existence has shown certain possibilities.

Astronomers looking for signs of extraterrestrial life have been focusing their search on exoplanets located in the star's habitable zone-a region that is warm enough to ensure the existence of liquid water on the planet's surface. In frozen deep space, a world too far away from the host star may not be suitable for life.

However, space is not always so cold, as Harvard University's Abraham Loeb said. The early universe was full of super-hot gases, or plasmas, that gradually cooled and concentrated to form stars and galaxies. The first light emitted by the plasma is the cosmic microwave background radiation (CMB).

Now the temperature of CMB is about a few degrees above absolute zero, but Rob calculated that 15 million years after the Big Bang, the radiation generated was warm enough to turn the entire universe into a huge habitable area. The life-friendly era lasted for hundreds of years. Million years, this time is enough for microbes, not complex life, to emerge. ^[7]

Teruyuki returns to the moon in the Takeri Story (circa 1650).

In literary and artistic works, humans often classify aliens differently. Some are classified according to their parent stars, such as Martians, Pleiades, Sirius, Lyra, etc .; some are classified according to appearance characteristics, such as reptiles. , Little grey man, little green man, etc.

Some claim to have been abducted by flying aliens, notable events such as the Pascagoula incident in 1973 and the abduction of Hills by aliens, but experiments by researchers at the University of California, Los Angeles have shown that many aliens The event may simply be a subconscious act of the brain. Most UFO incidents are either human-made flying machines or spacecraft, or just pranks.

"Alien"

The sign next to State Highway 375, Nevada, was named "Alien Highway" due to its proximity to Area 51.

People often blame some scientifically unexplainable phenomena as masterpieces of aliens. This has even formed a culture of "aliens", which is more typical of the phenomenon of wheat field circles. Since the 1970s, wheat field circles in England have been widely reported. By the late 1980s and early 1990s, the wheat field circle phenomenon has been widely known throughout the world. Super-alien supporters believe that the wheat field circle is a mark made by an alien aircraft, or some information that aliens convey to humans; but most wheat field circles can be regarded as just a kind of prank or performance art. ^[8]

Fiction

Many sci-fi or anime works have alien life as their basic setting. For example: the earth was invaded by alien creatures (such as World War, Utopia, Martians playing with Earth, Independence Day, Skyrim Holocaust, etc.); humans and alien visitors live in peace (such as ET, third-type contact, etc.) ; Aliens take the initiative to help humans, or use their strength to fight against invaders (such as Superman, Superhuman Overlord, Dragon Ball, Transformers, Ben 10, etc.); humans invade or oppress aliens (such as Avatar, District 9, etc.) ); Aliens are the founders of human civilization or human beings (such as the fifth element, strong colony armor, interstellar gate, the god of the gods, Prometheus, etc.).

In addition to simple relationships, some works are described with multiple dimensions and worldviews, such as armed conflict between humans and alien life for complex reasons (such as the space battleship Yamato, Macross, legendary King Eden, and finally World War I, Gundam 00 Theatrical Edition, etc.); in the world view, the masses knew nothing about alien life, but they used metaphors to indicate the existence of alien life (such as the contact of time, X file, etc.), or its existence was affected by a certain Organizations conceal (such as men in black etc.); the world view focuses on all beings in the universe (such as Star Wars, Star Trek, base series, Gopra, Naruto, etc.); the world view shows humanity and alien civilization The appearance of co-prosperity, in fact, the Earth government has been controlled by aliens (such as the decisive victory, Gintama, etc.).

The prosperity of alien films is generally considered to have begun in 1951 by American film director Howard Hawks' "Things From Another World". Known as "the best work of science fiction movies" and "the most influential film that led to the prosperity of science fiction movies in the 1950s", the film describes the humanoid alien plants landing on the North Pole of the Earth through UFO and carrying out terrorist activities. With the appearance of several famous alien films in the 1950s, such as "Star Wars" in 1953, "It comes from outer space", "Isolated Earth" in 1955, and "The Captive Invasion" in 1956 ", The aliens have established their place in the art of film; the advent of the space age has increased the influence of the film and its potential realist significance.