MessageToEagle.com - In 2 billion years' time, life on Earth will disappear, according to PhD astrobiologist
Jack O'Malley James of the University of St Andrews.
The new research also suggests that though the hardiest forms of life may have a foothold on similar worlds in
orbit around other stars, evidence for it may be very subtle.
All species have finite lifetimes, with each eventually facing an event that leads to its extinction. This can be
sudden and catastrophic, like the giant impact that wiped out the dinosaurs, or a slow and gradual process.
Ultimately, a combination of slow and rapid environmental changes will result in the extinction of all species on
Earth, with the last inhabitants disappearing within 2.8 billion years from now.
The main driver for these changes will be the Sun. As it ages over the next few billion years, the Sun will remain
stable but become steadily more luminous, increasing the intensity of its heat felt on Earth and warming the planet
to such an extent that the oceans evaporate.
Increased evaporation rates and chemical reactions with rainwater will draw more
and more carbon dioxide from the Earth's atmosphere, within the next billion years.
In his new work, O'Malley James has created a computer model to simulate these extremely long-range temperature
forecasts and has used the results to predict the timeline of future extinctions.
The falling levels of CO2 will lead to the disappearance of plants and animals and our home planet will
become a world of microbes.
At the same time the Earth will be depleted of oxygen and will be drying out as the rising temperatures lead
to the evaporation of the oceans. A billion years after that the oceans will have gone completely.
"The far-future Earth will be very hostile to life by this point", said O'Malley-James.
"All living things require liquid water, so any remaining life will be restricted to pockets of liquid water,
perhaps at cooler, higher altitudes or in caves or underground".
This life will need to cope with many extremes like high temperatures and intense ultraviolet radiation and
only a few microbial species known on Earth today could cope with this.
The new model not only tells us a lot about our own planet's future, but it can also help us to recognise
other inhabited planets that may be approaching the end of their habitable lifetimes.
"When we think about what to look for in the search for life beyond Earth our thoughts are largely
constrained by life as we know it today, which leaves behind telltale fingerprints in our atmosphere
like oxygen and ozone," O'Malley-James adds.
"Life in the Earth's far future will be very different to this, which means, to detect life like this
on other planets we need to search for a whole new set of clues."
Lake In France Turns Red
This year, we have encountered the color red in places where we don't expect to see it. A while back the strange appearance
of Azov Sea stunned residents who saw how the water had turned red. The red rocks in China have also puzzled scientists for a long time.
Now, a lake in Southern France has also suddenly turned red.
An Incredible Geological Phenomena
Earth is an amazing planet and our nature is full of wonders. We have previously written about incredible singing plants.
This time we would like to focus our readers' attention on another amazing geological phenomena, namely so-called growing stones.
It is difficult to image that stones can really grow, but these stones seem to be alive!
Yangtze River In China Turns Red
We have seen on a couple of occassions how lakes and seas have suddenly turned red.
In August a lake in Southern France unexpectedly changed color and shortly before that the strange appearance of
Azov Sea stunned residents who saw how the water had turned red....