What are they?
Time Travelers?
Angels or
Aliens?
Unexplained aerial observations have been reported throughout history. Some were undoubtedly astronomical in nature: comets, bright meteors, one or more of the five planets that can be seen with the naked eye, planetary conjunctions, or atmospheric optical phenomena such as parhelia and lenticular clouds. An example is
Halley's Comet, which was recorded first by
Chinese astronomers in 240 BC and possibly as early as 467 BC. Such sightings throughout history often were treated as supernatural portents, angels, aliens extraterrestrial, extraterrestrial life or other religious omens. Some current-day
Search for
Extraterrestrial or
UFO researchers have noticed similarities between some religious symbols in medieval paintings and UFO reports though the canonical and symbolic character of such images is documented by art historians placing more conventional religious interpretations on such images with regards to the
Evidence of
Extraterrestrial beings who visited
Earth.
Alien life, such as microorganisms, has been hypothesized to exist in the
Solar System and throughout the universe. According to this argument, made by scientists such as
Carl Sagan and
Stephen Hawking, it would be improbable for life not to exist somewhere other than Earth. This argument is embodied in the
Copernican principle, which states that Earth does not occupy a unique position in the
Universe, and the mediocrity principle, which suggests that there is nothing special about life on Earth. The chemistry of life may have begun shortly after the
Big Bang, 13.8 billion years ago, during a habitable epoch when the Universe was only
10–17 million years old.
Life may have emerged independently at many places throughout the Universe. Alternatively, life may have formed less frequently, then spread—by meteoroids, asteroids and other small Solar System bodies between habitable planets in a process called panspermia. In any case, complex organic molecules necessary for life may have formed in the protoplanetary disk of dust grains surrounding the Sun before the formation of
Earth based on computer model studies. Suggested locations where life might have developed include the planets
Venus and Mars,
Jupiter's moon
Europa, and
Saturn's moons Titan and Enceladus. In May
2011,
NASA scientists reported that Enceladus "is emerging as the most habitable spot beyond Earth in the Solar System for life as we know it". Since the
1950s, scientists have promoted the idea that "habitable zones" are the most likely places to find life. Numerous discoveries in this zone since
2007 have stimulated estimations of frequencies of
Earth-like habitats numbering in the many billions though as of
2013, only a small number of planets have been discovered in these zones. Nonetheless, on
November 4, 2013, astronomers reported, based on
Kepler space mission data, that there could be as many as 40 billion Earth-sized planets orbiting in the habitable zones of
Sun-like stars and red dwarfs in the
Milky Way, 11 billion of which may be orbiting Sun-like stars. The nearest such planet may be 12 light-years away, according to the scientists. Astrobiologists have also considered a "follow the energy" view of potential habitats. No widely accepted evidence of extraterrestrial life has been found; however, various controversial claims have been made. Beliefs that some unidentified flying objects are of extraterrestrial origin, along with claims of alien abduction, are dismissed by most scientists. Most
UFO sightings are explained either as sightings of
Earth-based aircraft or known astronomical objects, or as hoaxes. In
November 2011, the
White House released an official response to two petitions asking the
U.S. government to acknowledge formally that aliens have visited Earth and to disclose any intentional withholding of government interactions with extraterrestrial beings. According to the response, "
The U.S. government has no evidence that any life exists outside our planet, or that an extraterrestrial presence has contacted or engaged any member of the human race. Also, according to the response, there is "no credible information to suggest that any evidence is being hidden from the public's eye. The response further noted that efforts, like
SETI, the
Kepler space telescope and the NASA
Mars rover, continue looking for signs of life. The response noted "odds are pretty high" that there may be life on other planets but "the odds of us making contact with any of them especially any intelligent ones are extremely small, given the distances involved. There are many sources of Aliens and UFOs / UFO
Sightings like for example: wikileaks ufo disclosure, wikileaks ufo documents, wikileaks ufo files, wikileaks ufo and so on… you can search also this following words for more info. about extraterrestrial life.
Real ufo, recent ufo,
Roswell UFO,
China UFO, etc. or just search simple UFO if you are interested in this field.
- published: 18 Sep 2012
- views: 976981