The recently unearthed 11-page typed draft by Winston Churchill revealed his deep thoughts about the universe and the unknown.
The papers were written around 1950, but were never published. Experts say, it was probably intended for a newspaper.
Winston Churchill is one of the great minds with imagination that explored beyond worlds (c) Alchetron
In the 1980s, the essay was passed to a US museum, where it sat until its rediscovery last year.
Israeli astrophysicist and author Mario Livio described the contents of the essay in the latest issue of Nature
journal. It was passed to him by the National Churchill Museum in Fulton, Missouri, new director Timothy Riley.
He told the BBC's Inside Science
program, "[Mr Riley] said, 'I would like you to take a look at something.' He gave me a copy of this essay by Churchill. I saw the title, Are We Alone in the Universe? And I said, 'What? Churchill wrote about something like this?'"
In the essay, Churchill correctly predicted the great opportunities for exploration of the Solar System:
"One day, possibly even in the not very distant future, it may be possible to travel to the Moon, or even to Venus and Mars," Churchill wrote.
The politician also mentioned in his essay, "I for one, am not so immensely impressed by the success we are making of our civilisation here that I am prepared to think we are the only spot in this immense universe which contains living, thinking creatures, or that we are the highest type of mental and physical development which has ever appeared in the vast compass of space and time."
Churchill also thought about the possibility that other stars would host planets, concluding that a large fraction of these distant worlds "will be the right size to keep on their surface water and possibly an atmosphere of some sort".
It was more than 50 years before the discovery of exoplanets that he surmised, some would be "at the proper distance from their parent sun to maintain a suitable temperature".