UFO Casebook head graphic

UFO Casebook - Sightings, Case Files, Photos, Videos, Abduction

Extraterrestrial Life Is Likely, So Where Are All The Aliens?

UFO Depiction
Published: 3:30 PM 7/22/2015

the likelihood of extraterrestrial life is high...

Posted By: Clayton Browne

According to most scientific experts, given the vastness of the universe, the likelihood of extraterrestrial life is high. In fact, the odds of alien life elsewhere in the universe has gone up considerably in the last 10 to 15 years as we have discovered that the preconditions for life (a planet in habitable temperature zone with water and the presence of the chemical building blocks for life) are not that uncommon in our galaxy.

Extraterrestrial Life

The growing likelihood of extraterrestrial life obviously begs the question of where are all the aliens? Unfortunately, the answer to the question is quite complex and there are half a dozen competing theories to explain the apparent lack of aliens.

"Rare Earth hypothesis"

One of the most reasonable explanations for the lack of proof of aliens to date is the "rare Earth hypothesis."

This explanation suggests that habitable planets such as Earth are rarer than we think for reasons currently unknown to us. That is, even if there are billions of planets in the habitable “Goldilocks zone”, maybe gamma rays or asteroids or other unknown problems stopped life from developing.

George Mason economics professor Robin Hanson suggested the possibility of a “great filter” that lies “along the path between simple dead stuff and explosive life” that is very difficult or even impossible to move beyond. If the “filter” happens at the early stages of life, that would explain why no other planet has produced life.

Some "rare Earth hypothesis" supporters such as paleontologist Peter Ward and astronomer Donald Brownlee argue that the development complex, intelligent life on this planet may even be a once-in-a-Big Bang occurrence.

Maybe nearly all alien life is non-technological

“The absence of strong radio beacons, television broadcasts, robotic spacecraft, obelisks on the moon — all of those absences add up to give us the suggestion that our galaxy is not teeming with technological life,” Geoffrey Marcy, an astronomer at Cal Berkeley, explained to The Washington Post in February.

So maybe the reason we have found no proof that other life that exists because that life has not developed communications technology.

Along these lines, NASA’s chief scientist Ellen Stofan said earlier this year that humans would indeed discover life beyond Earth in the next couple of decades. But we won't find “little green men,” she noted at a public panel in this spring.

“We are talking about little microbes,” she said.

Another possibility, of course, is that extraterrestrial life is trying to communicate with us, but their signals haven’t reached us yet or they have and we don’t recognize them as a communication.

Aliens too advanced to care about humans.

One other possibility is that highly advanced aliens may have already visited Earth, but before humans could document the visits. many who believe this theory say they may even have left signs of their presence behind.

The explanation goes on to suggest that the aliens just weren’t interested in humans because we are not advanced enough or too violent or Earth doesn’t have resources they need, so they just left. Earth is part of an isolated "zoo" of primitive species

A final possible explanation for the lack of extra-terrestrial life is the “Zoo hypothesis,” suggested by academic John Ball. “Extraterrestrial intelligent life may be almost ubiquitous,” notes the abstract to Ball’s 1973 paper in the journal Icarus. “The apparent failure of such life to interact with us may be understood in terms of the hypothesis that they have set us aside as part of a wilderness area or zoo.”

permanent link: http://www.ufocasebook.com/2015/et-presence-likely-where-are-they.html

source & references:


edited by www.ufocasebook.com

Connect with the UFO Casebook...

UFO Casebook on Youtube Google+ UFO Casebook News Feed UFO Casebook on Facebook Forum Recent Comments


Fair Use Notice: This web site contains some copyrighted material whose use has not been authorized by the copyright owners. We believe that this not-for-profit, educational use on the Web constitutes a fair use of the copyrighted material (as provided for in section 107 of the US Copyright Law.)

If you wish to use this copyrighted material for purposes that go beyond fair use, you must obtain permission from the copyright owner.

Fair Use notwithstanding, we will immediately comply with any copyright owner who wants their material removed or modified. All articles and images contained on the UFO Casebook which are not created by the UFO Casebook are attributed to the original owner/creator.

The opinions and viewpoints expressed on the UFO Casebook articles are not necessarily those of the UFO Casebook owner, webmaster, or staff members.
Each article is attributed to its originator, which is listed at the bottom of each entry, when available.

Archived UFO Articles and News Items

UFO Casebook Home Page