Prof Hawking often had a bleak outlook for the future of humanity, and regularly warned the planet is perilously close to destruction.
The late theoretical physicist said on several occasions that humans need to find a new home, as Earth has shown that it is entering its final phase.
Speaking at the Oxford Union in 2016, Prof Hawking said: “We will map the position of millions of galaxies with the help of [super] computers like Cosmos. We will better understand our place in the universe.
“Perhaps one day we will be able to use gravitational waves to look right back into the heart of the Big Bang.
“But we must also continue to go into space for the future of humanity.
“I don’t think we will survive another 1,000 years without escaping beyond our fragile planet.”
This was not the first time that the father-of-three has predicted the end for humanity unless space travel is conquered.
In a book titled ‘How to Make a Spaceship: A Band of Renegades, an Epic Race, and the Birth of Private Spaceflight’ by journalist Julian Guthrie, Professor Hawking shared his thoughts in an afterword.
The Oxford-born physicist wrote: “I believe that life on Earth is at an ever-increasing risk of being wiped out by a disaster, such as a sudden nuclear war, a genetically engineered virus, or other dangers.
“I think the human race has no future if it doesn’t go to space.”
Professor Hawking has said that the huge population growth is a problem for our planet, and eventually the burden will be too much for the Earth to handle.
He said at the 2017 Tencent WE Summit Earth: “By the year 2600, the world’s population would be standing shoulder to shoulder, and the electricity consumption would make the Earth glow red-hot.
“This is untenable.”
Climate change will also play its part in the destruction of Earth, says Prof Hawking, and said that certain world leaders, particularly Donald Trump, are contributing to the problem.
Professor Hawking said US President Donald Trump’s decision to withdraw from the Paris Climate Agreement, has doomed Earth to one day become uninhabitable.
Prof Hawking says in the show anyone who does not believe in global warming should do some research on Venus.
Venus, the second closest planet to the sun, was once Earth-like.
But a build-up of greenhouse gasses in its atmosphere turned the planet into a boiling celestial body with temperatures of 250 degrees celsius and wind speeds of up to 100 metres per second.
When President Trump pulled the US out of the Paris Climate Agreement last year, Prof Hawking said: “We are close to the tipping point where global warming becomes irreversible.
“Trump’s action could push the Earth over the brink, to become like Venus, with a temperature of two hundred and fifty degrees, and raining sulphuric acid.
“Climate change is one of the great dangers we face and it’s one we can prevent if we act now.
“By denying the evidence for climate change, and pulling out of the Paris Climate Agreement, Donald Trump will cause avoidable environmental damage to our beautiful planet, endangering the natural world, for us and our children.”
Professor Hawking died aged 76 in the early hours of March 14.
In a statement his children, Lucy, Robert and Tim said: “We are deeply saddened that our beloved father passed away today.
“He was a great scientist and an extraordinary man whose work and legacy will live on for many years.
“His courage and persistence with his brilliance and humour inspired people across the world.
“He once said, ‘It would not be much of a universe if it wasn’t home to the people you love.’ We will miss him forever.”
Professor Hawking suffered from a rate early-onset slow-progressing form of amyotrophic lateral sclerosis (ALS), also known as motor neurone disease or Lou Gehrig’s disease.
He was diagnosed with motor neurone disease in 1963 at the age of 21.
Doctors expected him to live for only two more years, but he had a form of the disease which progressed more slowly than usual.
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Facebook billionaire Mark Zuckerberg and Stephen Hawking to launch $100 million hunt for ALIENS
FACEBOOK founder Mark Zuckerberg and Dr Stephen Hawking are joining forces in the hunt to make contact with ALIEN life.
The two men, joined by Russian entrepreneur Yuri Milner, will be listening to signals from the planet Proxima B – which is four light years from Earth and is thought to have the right conditions for life.
The trio of some of the world’s richest and intelligent men are funding a $100m (£76million) project dubbed “Breakthrough Listen”, the Mail Online exclusively reported.
The project will use the world’s most powerful telescopes to listen to sounds on Proxima B.
Astronomers learned last month that our nearest star, Proxima Centauri, is the sun to the planet which has similar conditions to Earth.
Yuri Milner told the Mail Online: “It came only a few months after Stephen Hawking and I, with Mark Zuckerberg’s support, launched our Breakthrough Starshot project, which aims to launch a tiny spacecraft to Alpha Centauri within a generation.
“At the time, we hoped there was a planet in the Centauri system, but we didn’t know.
“Now we have a definite target. That makes the mission feel more tangible.”
Although Proxima B is four light years away it is thought future generations of spacecraft could travel there in the next few decades.
Early in October the Breakthrough Listen team will look for radio emissions from the planet that differ from the natural background noise.
Parkes Observatory in Australia will be used for picking up signals.
Andrew Siemion, Director of Berkeley SETI (Search For Extraterrestrial Intelligence) Research Center said: “It is difficult to predict how long the search will take, but we know that all the conditions necessary for life to arise on Earth are ubiquitous in the universe.”
He added: “Terrestrial technology is a challenging problem.
“Our notion of what types of emission are produced by technology is informed by our own technology…our own technology presents a significant interfering background.’
Professor Stephen Hawking has always been certain alien life is out there.
In the film “Stephen Hawking’s Favorite Places, he said: “Gazing at the stars I always imagined there was someone up there looking back,
“As I grow older I am more convinced than ever that we are not alone.”
The Breakthrough Listen team has already collected data on other star systems using the Green Bank Radio Telescope in West Virginia and Lick Observatory’s Automated Planet Finder in California.