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As for the possible risks, theoretical physicist Stephen Hawking warned in 2010 that humans should not try to contact alien life forms. He warned that aliens might pillage Earth for resources. "If aliens visit us, the outcome would be much as when Columbus landed in America, which didn't turn out well for the Native Americans", he said. [157]
Planetary habitability in the Solar System is the study that searches the possible existence of past or present extraterrestrial life in those celestial bodies. As exoplanets are too far away and can only be studied by indirect means, the celestial bodies in the Solar System allow for a much more detailed study: direct telescope observation, space probes, rovers and even human spaceflight.
It took 4.5 billion years for intelligent life to evolve on Earth, and life as we know it will see suitable conditions for 1 [16] to 2.3 [17] billion years more. Red dwarfs, by contrast, could live for trillions of years, as their nuclear reactions are far slower than those of larger stars, [a] meaning that life would have longer to evolve and ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 20 January 2025. Problem of the lack of evidence for alien life despite its apparent likelihood This article is about the absence of clear evidence of extraterrestrial life. For a type of estimation problem, see Fermi problem. Enrico Fermi (Los Alamos 1945) The Fermi paradox is the discrepancy between ...
While Earth is the only place in the Universe known to harbor life, [10] [11] estimates of habitable zones around other stars, [12] [13] along with the discovery of thousands of exoplanets and new insights into the extreme habitats on Earth where organisms known as extremophiles live, suggest that there may be many more habitable places in the ...
Nordic aliens [11] [12] Sometimes called Space Brothers [13] Plejaren (previously known as Pleiadeans from the Pleiades) [14] Venusians [13] [15] Tall whites [16] Agarthans from Agartha [17] Humanoids with stereotypical "Nordic features" (tall, blonde hair, blue eyes) and which have featured in several cases of contact.
Question: How did you get interested in space and astronomy? Answer: I got interested in space on July 20, 1969.That was the day of the first moon landing and that was the day I realized I wanted ...
This is a list of exoplanets within the circumstellar habitable zone that are either under 10 Earth masses or smaller than 2.5 Earth radii, and thus have a chance of being rocky.