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Space aliens are alleged to be overwhelmingly humanoid, and are allegedly able to exist on Earth without much difficulty often lacking "space suits", even though extra-solar planets would likely have different atmospheres, biospheres, gravity and other factors, and extraterrestrial life would likely be very different from Earthly life.
The extraterrestrial hypothesis is the idea that some UFOs are vehicles containing or sent by extraterrestrial beings (usually called aliens in this context). [13] As an explanation for UFOs, ETI is sometimes contrasted with EDI (extradimensional intelligence), for example by J. Allen Hynek. [24]
For example, during the Barney and Betty Hill incident, the first recorded claim of an alien abduction, the couple reported that they were abducted and experimented on by aliens with oversized heads, big eyes, pale grey skin, and small noses, a description that eventually became the grey alien archetype once used in works of fiction.
The following outline is provided as an overview of and topical guide to extraterrestrial life: Extraterrestrial life – is any type of lifeform, from prokaryotes to intelligent beings, that is neither native of Earth or transplanted from it. So far, no extraterrestrial life has ever been found. [1]
[83] 2013 research at NASA's Johnson Space Center, however, shows that faster-than-light travel with the Alcubierre drive requires dramatically less energy than previously thought, [85] needing only about 1 tonne of exotic mass-energy [86] to move a spacecraft at 10 times the speed of light, in contrast to previous estimates that stated that ...
Research into UFOs, including ufology, has often been criticized for working with or providing only little or low-quality data, especially as adherence to the "extraordinary claims require extraordinary evidence" adage is a guiding principle of scientific inquiry. The project aims to address the data-quality issue by setting up new sensor systems.
Alien vs. Predator is the first of the Alien movies set in the present day and not the distant future. It follows an expedition led by Charles Bishop Weyland (Lance Henriksen) as the crew ...
Aliens from Mars launch an invasion of Earth in H. G. Wells' The War of the Worlds, as illustrated by Henrique Alvim Corrêa.. Alien invasion or space invasion is a common feature in science fiction stories and films, in which extraterrestrial lifeforms invade Earth to exterminate and supplant human life, enslave it, harvest people for food, steal the planet's resources, or destroy the planet ...