Experts claim the universe is 'littered with dead alien civilisations'

My thought is different than this. Civilizations that don't want to go to war with other civilizations on other planets need only change the time of that planet to accomplish this. So, if a civilization is advanced enough to have time travel it is advanced enough to prevent war with other planets by doing this. And this is likely true throughout the galaxy and in other galaxies too. It is a way to prevent wars between all planets (if the civilization is advanced enough technologically).

 

Experts claim the universe is 'littered with dead alien civilisations'

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They WERE out there: Experts claim the universe is 'littered with dead alien civilisations'

Scientific paper's authors claim the chance we are alone is just one in 10 billion trillion

 

If there were ever aliens out there, they may already all be extinct Getty

By GEORGE HARRISON

04:29, 1 May 2016

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ALIEN life was once plentiful across the universe but we will never make contact with any because they've all died out - a new theory suggests.
Scientists believe that space may have been populated by a vast number of alien communities in the past after analysis showed that as many as one fifth of all stars are orbited by planets that could sustain life.
The scientists behind this theory are Adam Frank and Woodruff Sullivan, who work at the astronomy department and astrobiology program at the University of Washington.
Startlingly, they argue that there is a minute probability of just one in 10 billion trillion that there has never been any extra-terrestrial life in space.

Space is so vast that there are almost certainly other species out there... it's just finding them which is the problem Getty

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However, whilst they are certain that there are - or were - aliens out there, space is so vast that there is almost no chance we will ever come across them.
The researchers also worked out how long the average civilisation lasts, to get a sense of the lifespan of alien societies.
They reach the conclusion that, over the 13-billion-year lifespan of the universe, it’s likely that any other civilisations out there have already gone extinct.

By analysing civilisations on Earth, researchers were able to predict how long space societies would have lasted Getty

One of the paper’s authors, Adam Frank, said: “Our results imply that our evolution has not been unique and has probably happened many times before.
“The other cases are likely to include many energy-intensive civilizations dealing with their feedback onto their planets as their civilizations grow.
“That means we can begin exploring the problem using simulations to get a sense of what leads to long lived civilizations and what doesn’t.”
Scientists have spent years obsessing over the quest to find alien life, with astronomers raising as many questions as they answer with every new theory.
However, NASA are hopeful that they can lead the charge to find alien life, and there are high hopes for the probe they are set to soon launch to Jupiter.