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How Long Can Life On Earth Last And What Might Cause A Planet Wide Extinction Event? -

How Long Can Life On Earth Last And What Might Cause A Planet Wide Extinction Event? por V101 Science   3 anos atrás

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One day, the Earths ability to support life as we no it will cease to exist and our species, plus the creatures we share the planet with will all be gone. Hopefully, by this point Humans would of moved on, expanded across the galaxy and colonised many new planets, ensuring our survival. But what could cause an entire Earth extinction? And long have we got left?

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Script -
The Earth and the life that it allows to exist, has experienced many catastrophic events in the past, from massive volcanic eruptions to huge Asteroid impacts, but after 3.5 billion years, life still prevails. It is clearly very hard to completely eradicate all life on Earth as history has shown, and the future of this planet is not safe yet, as Earth will most definitely experience many more apocalyptic style events before its time is up. Scientists predict, for example that a super volcano Eruption, like the one that occurred 250 million years ago during the end of the Permian period could happen again. This life destroying event wiped out 96% of all marine species and 70% of terrestrial vertebrate species. It very nearly caused the ultimate extinction and this could potentially happen again within the next 100 million years. It is also believed that huge asteroids, like the one that obliterated the dinosaurs may strike the Earth every 500 million years or so. However, the Earth has been hit by many other large asteroids in the past and have barely registered as life destroyers. In order for an Asteroid to wipe out all life on Earth, it would need to be 60 miles wide according to scientists. A space rock around a half a mile wide for example can do a lot of damage and cause widespread Earthquakes, releasing energy equal to 100 billion tons of TNT, but it would not wipe out all life in Earth. But in the vastness of space, asteroids may be the least of Earths worries, as there is a possibility that we could be obliterated by huge comets that have been pushed out of the Oort Cloud by wandering stars. Only 70,000 years ago, a red dwarf called Scholz's star cruised through the outer reaches of the solar system and terrifyingly, astronomers have identified a potential 14 wandering stars on a collision course with our solar system within the next few million years. For example The dwarf star HIP-85605 as a 90% chance of crashing in to the Oort Cloud around 240,000 years from now. But if Earths resistant life managed to survive all of these dramatic doomsday scenarios, eventually astronomical forces will render the planet uninhabitable. Scientists have calculated that somewhere between 1.75 billion and 3.25 billion years from now, Earth will travel out of the solar system's habitable zone and into the "hot zone". As the sun grows in size it will become hotter and brighter over time, this increasing heat would slowly evaporate all of Earths liquid water and these new conditions would render life on Earth impossible. Our planet is already on the inner edge of the Sun’s habitable zone, but this area of safety is moving outwards at a rate of about 1 metre per year. Scientists predict a total habitable zone lifetime for Earth of 6.3 billion–7.8 billion years, suggesting that life on this planet is already about 70% of the way through its run.So at some point in the far future Earth may be presented with a planet wide doomsday event and all of Earths magnificent life may perish as one. However, Earth might have one advantage, and that is Human beings, by this stage we might have the technology to prevent such a cataclysmic event from occurring, saving the Earth and everything that exists on its surface.
Attribution -
Rotating Earth-Jeffrey Conway
Burning Planet - Marco Masotti
Raw Shibuya Footage-Patrick Makhoul
Calbuco Volcano Eruption.-Francisco Negroni
VFX Meteor Project-Nick Reid
Blue Sun - Jason Fletcher
Solar System Animation - ESA
Desert Surface-Rory BarnesESO

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