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Post Reply The aliens are silent because they're dead
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Hoosierville
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Posted 1/25/16 , edited 1/25/16
http://www.sciencedaily.com/releases/2016/01/160121110932.htm


Life on other planets would likely be brief and become extinct very quickly, say astrobiologists from The Australian National University (ANU).

In research aiming to understand how life might develop, the scientists realized new life would commonly die out due to runaway heating or cooling on their fledgling planets.

"The universe is probably filled with habitable planets, so many scientists think it should be teeming with aliens," said Dr Aditya Chopra from the ANU Research School of Earth Sciences and lead author on the paper, which is published in Astrobiology.

"Early life is fragile, so we believe it rarely evolves quickly enough to survive."

"Most early planetary environments are unstable. To produce a habitable planet, life forms need to regulate greenhouse gases such as water and carbon dioxide to keep surface temperatures stable."

About four billion years ago Earth, Venus and Mars may have all been habitable. However, a billion years or so after formation, Venus turned into a hothouse and Mars froze into an icebox.

Early microbial life on Venus and Mars, if there was any, failed to stabilize the rapidly changing environment, said co-author Associate Professor Charley Lineweaver from the ANU Planetary Science Institute.

"Life on Earth probably played a leading role in stabilizing the planet's climate," he said.

Dr Chopra said their theory solved a puzzle.

"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," he said.

Wet, rocky planets, with the ingredients and energy sources required for life seem to be ubiquitous, however, as physicist Enrico Fermi pointed out in 1950, no signs of surviving extra-terrestrial life have been found.

A plausible solution to Fermi's paradox, say the researchers, is near universal early extinction, which they have named the Gaian Bottleneck.

"One intriguing prediction of the Gaian Bottleneck model is that the vast majority of fossils in the universe will be from extinct microbial life, not from multicellular species such as dinosaurs or humanoids that take billions of years to evolve," said Associate Professor Lineweaver.
Werina 
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Posted 1/25/16
mhhh.... aliens.
Posted 1/25/16

Werina wrote:

mhhh.... aliens.


That's hot
Posted 1/25/16
That or they are avoiding us.

If true.... Well, this kinda sad actually.
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Posted 1/25/16

SylveonLuna wrote:


Werina wrote:

mhhh.... aliens.


That's hot


Posted 1/25/16 , edited 1/25/16


You see I didn't agree with werina.

That's hot is the only response I can give to werina now.

Regardless of the situation.
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Hoosierville
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Posted 1/25/16 , edited 1/25/16

SylveonLuna wrote:



You see I didn't agree with werina.

That's hot is the only response I can give to werina now.

Regardless of the situation.


So she has you well trained.
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53 / M
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Posted 1/25/16
OMG, they killed the aliens. You bastards!
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26 / F / Overlord's Castle
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Posted 1/25/16
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33 / M / outer wall, level...
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Posted 1/25/16 , edited 1/25/16
i still say thats hot.
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31 / M / L'Étoile du Nord,...
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Posted 1/25/16
I think any intelligent life out there is dodging us because they don't want to get brain cancer.
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M
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Posted 1/25/16 , edited 1/25/16
Look at how we depict and treat them in movies and other media, I say they most likely avoiding us.
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Posted 1/25/16

twintiger12 wrote:

Look at how we depict and treat them in movies and other media, I say they most likely avoiding us.


If I were an alien I would avoid us too.
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Posted 1/25/16
I can only pray they avoid us. Contact with Aliens will likely lead to outright war and extermination of all humans; I mean that would be an okay deal if I survived but alas the chance of that occurring is slim.
runec 
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Posted 1/25/16
Well, I don't see why you would want to land on a planet where every depiction of alien life in the media ends with us either trying to kill it or have sex with it.

We are literally an intergalactic game of Fuck, Marry, KIll in planet form.
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