Saturday, June 24, 2017
Contact us    |    Advertise    |   Help   RSS icon Twitter icon Facebook icon
    Home  ·  News  ·  Forum  ·  Stories  ·  Image Gallery  ·  Columns  ·  Encyclopedia  ·  Videos
Find: in

Could alien life have already gone extinct ?


Posted on Thursday, 21 January, 2016 | Comment icon 66 comments

The fragility of early life might make it particularly prone to extinction. Image Credit: NASA
Even if we do find a habitable planet, could its indigenous life forms have already died out long ago ?
Astronomers at SETI have been listening out for signs of extraterrestrial civilizations for years but despite their best efforts have so far come up empty.

While many believe that the reason for this is that the distances between worlds is too great or that it is unlikely anyone within range would be at the same technological level as we are, astrobiologists at the Australian National University maintain that life on any nearby habitable worlds might have simply gone extinct long before we ever started looking.

"The universe is probably filled with habitable planets, so many scientists think it should be teeming with aliens," said study lead author Dr Aditya Chopra. "Early life is fragile, so we believe it rarely evolves quickly enough to survive. Most early planetary environments are unstable. "

The emergency of life on other worlds may be limited by what the scientists have called the 'Gaian bottleneck' which concerns the need for early organisms to modify and regulate the environment of a planet in order to ensure their own survival - something that did happen here on Earth.

"The mystery of why we haven't yet found signs of aliens may have less to do with the likelihood of the origin of life or intelligence and have more to do with the rarity of the rapid emergence of biological regulation of feedback cycles on planetary surfaces," said Dr Chopra.

Source: Mail Online | Comments (66)

Tags: Extraterrestrial, Life

Recent comments on this story
Comment icon #57 Posted by Harte on 4 February, 2016, 22:35
The concept itself is based on single-galaxy populations. Obviously, nobody can say much about universal populations. Harte
Comment icon #58 Posted by Thorvir Hrothgaard on 5 February, 2016, 19:46
I'm going to assume you were trying to be funny, so allow me to pile in as well. On planet Earth we are not the intelligent specie it is actully dolphins with sonar. Yeah, I agree. So many dolphins have taken themselves to the Moon and back, have perform heart transplants, have created computers, and have established civilizations that it's so completely embarrassing to be a human at this time.
Comment icon #59 Posted by badeskov on 5 February, 2016, 20:20
I'm going to assume you were trying to be funny, so allow me to pile in as well. Yeah, I agree. So many dolphins have taken themselves to the Moon and back, have perform heart transplants, have created computers, and have established civilizations that it's so completely embarrassing to be a human at this time. If only you knew...... Cheers, Badeskov
Comment icon #60 Posted by DONTEATUS on 5 February, 2016, 21:14
Remember "So Long and Thanks for All the Fish"
Comment icon #61 Posted by Derek Willis on 6 February, 2016, 8:11
I'm going to assume you were trying to be funny, so allow me to pile in as well. Yeah, I agree. So many dolphins have taken themselves to the Moon and back, have perform heart transplants, have created computers, and have established civilizations that it's so completely embarrassing to be a human at this time. I think dolphins are overrated. They are undoubtedly intelligent (but have yet to split the atom!) but they are not as nice as people seem to think. They sometimes kill their own young, often for fun. I think we nasty humans elevated dolphins to almost god-like status to satisfy our own... [More]
Comment icon #62 Posted by Thorvir Hrothgaard on 6 February, 2016, 18:27
I think dolphins are overrated. They are undoubtedly intelligent (but have yet to split the atom!) but they are not as nice as people seem to think. They sometimes kill their own young, often for fun. I think we nasty humans elevated dolphins to almost god-like status to satisfy our own needs. You know, "why can't we all live in peace and love each other like dolphins do?" Just because some dolphins are nice doesn't mean they all are. An argument used many times for many different peoples/races/critters.
Comment icon #63 Posted by DONTEATUS on 8 February, 2016, 3:54
Just Keep your Towels close by and Peanuts fresh ! "Dont Panic"
Comment icon #64 Posted by gatekeeper32 on 17 February, 2016, 4:45
"The chances of finding out what’s really going on in the universe are so remote, the only thing to do is hang the sense of it and keep yourself occupied."
Comment icon #65 Posted by TheGreatBeliever on 10 April, 2016, 17:43
Maybe we could drop by one still at the ancient egypt era n play god with them..
Comment icon #66 Posted by AbyssWalker on 11 April, 2016, 9:31
Aliens gone extinct? LMAO! The scientific clergy is steeped in denial. We have been visited by many different races over the centuries. Ancient megastructures, religion, WWII, Global warming. where do you think it all come from? People need to educate themselves better. Starting here: http://www.thewatche...lien_races.html I think alien life may be out there and *maybe* we're being visited, but listing 'known races' like it's common knowledge, without trying to present any kind of evidence makes this ET/UFO community look like a joke. If there is some truth to all this then we should rather fo... [More]


Please Login or Register to post a comment.


  On the forums
Forum posts:
Forum topics:
Members:

5931695
255167
167790

 
Scientists crack mystery of avian egg shape
6-24-2017
Researchers have finally worked out why some bird eggs are rounder while others are more pointy.
Magnetic beam could dispose of old satellites
6-24-2017
A French scientist is working on a novel new way to keep Earth's orbit clear of defunct satellites.
UK UFO files have finally been released
6-24-2017
The National Archives has published a collection of 15 Ministry of Defence files on the subject of UFOs.
Real-life treasure hunt has claimed two lives
6-23-2017
Two people have died while attempting to track down a $2M haul hidden somewhere in the Rocky Mountains.
Featured Videos
Gallery icon 
Predicting disasters
Posted 6-24-2017 | 0 comments
Richard A. Clarke talks about the ways in which catastrophes can be predicted in advance.
 
How big are spacecraft ?
Posted 6-23-2017 | 2 comments
Most images of spacecraft are set in space, which makes it hard to judge relative size.
 
Eusocial animals
Posted 6-22-2017 | 1 comment
How do ants and termites manage to create such enormous and impressive structures ?
 
Seeing the invisible
Posted 6-21-2017 | 0 comments
What if you could see invisible air currents, temperature gradients and pressure differences ?
 
Record-breaking aviary
Posted 6-20-2017 | 3 comments
The Shukavana bird home in Mysuru, India is home to 468 different species of birds.
 
 View: More videos
Stories & Experiences
Craig is here
6-10-2017 | Phoenix AZ
 
We saw the same thing!
6-10-2017 | Pooler, GA
 
 
Three female faces
6-5-2017 | Illinois (IL)
 
Encounter at 3:33 AM
6-5-2017 | Budapest
 
Trade school terror
5-26-2017 | Cedro woolley, Wa.
 
 
Someone is on my bed
5-4-2017 | Indianapolis
 
Being told
5-4-2017 | New Brunswick, Canada
 
Man in the hat
5-4-2017 | Brooklyn/NY
 

         More stories | Send us your story
 
Top   |  Home   |   Forum   |   News   |   Image Gallery   |  Columns   |   Encyclopedia   |   Videos   |   Polls
UM-X 10.7 Unexplained-Mysteries.com © 2001-2017
Privacy Policy and Disclaimer   |   Cookies   |   Advertise   |   Contact   |   Help/FAQ