In his final book Prof Hawking left behind a series of forecasts and warnings which could effect the human race.
One such problem is that Earth is becoming overpopulated and runaway climate change will destroy our planet.
For this reason, many experts such as Elon Musk and NASA have set their sights on colonising nearby celestial bodies such as Mars and the moon in order to ensure humanity’s future.
Prof Hawking, however, left behind much more ambitious missions, and believes in as little as 200 years, humans will have conquered interstellar travel and can begin colonising the Milky Way.