Winston Churchill is best known as a wartime leader, one of the most influential politicians of the twentieth century, a clear-eyed historian and an eloquent orator. He was also passionate about science and technology.
Aged 22, while stationed with the British Army in India in 1896, he read Darwin's On the Origin of Species and a primer on physics. In the 1920s and 1930s, he wrote popular-science essays on topics such as evolution and cells in newspapers and magazines. In a 1931 article in The Strand Magazine entitled 'Fifty Years Hence'1, he described fusion power: “If the hydrogen atoms in a pound of water could be prevailed upon to combine together and form helium, they would suffice to drive a thousand-horsepower engine for a whole year.” His writing was likely to have been informed by conversations with his friend and later adviser, the physicist Frederick Lindemann.
Noah Baker finds out about Winston Churchill’s close relationship with science.
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During the Second World War, Churchill supported the development of radar and Britain's nuclear programme. He met regularly with scientists such as Bernard Lovell, the father of radio astronomy. An exchange about the use of statistics to fight German U-boats captures his attitude. Air Chief Marshal Arthur 'Bomber' Harris complained, “Are we fighting this war with weapons or slide rules?” Churchill replied, “Let's try the slide rule.”2
He was the first prime minister to employ a science adviser, hiring Lindemann in the early 1940s. The science-friendly environment that Churchill created in the United Kingdom through government funding of laboratories, telescopes and technology development spawned post-war discoveries and inventions in fields from molecular genetics to X-ray crystallography.
Despite all this, it was a great surprise last year, while I was on a visit to the US National Churchill Museum in Fulton, Missouri, when the director Timothy Riley thrust a typewritten essay by Churchill into my hands. In the 11-page article, 'Are We Alone in the Universe?', he muses presciently about the search for extraterrestrial life.
He penned the first draft, perhaps for London's News of the World Sunday newspaper, in 1939 — when Europe was on the brink of war. He revised it lightly in the late 1950s while staying in the south of France at the villa of his publisher, Emery Reves. For example, he changed the title from 'Are We Alone in Space?' to 'Are We Alone in the Universe?' to reflect changes in scientific understanding and terminology. Wendy Reves, the publisher's wife, passed the manuscript to the US National Churchill Museum archives in the 1980s.
Riley, who became director of the museum in May 2016, has just rediscovered it. To the best of Riley's knowledge, the essay remained in the Reves's private collection and has never been published or subjected to scientific or academic scrutiny. Imagine my thrill that I may be the first scientist to examine this essay.
Here I outline Churchill's thinking. At a time when a number of today's politicians shun science, I find it moving to recall a leader who engaged with it so profoundly.
Churchill's reasoning mirrors many modern arguments in astrobiology. In essence, he builds on the framework of the 'Copernican Principle' — the idea that, given the vastness of the Universe, it is hard to believe that humans on Earth represent something unique. He starts by defining the most important characteristic of life — in his view, the ability to “breed and multiply”. After noting that some viruses can be crystallized, making them hard to categorize, he decides to concentrate on “comparatively highly-organised life”, presumably multicellular life.
His first point is that “all living things of the type we know require water”. Bodies and cells are largely composed of it, he notes. Other liquids cannot be ruled out but “nothing in our present knowledge entitles us to make such an assumption”. The presence of water in liquid form still guides our searches for extraterrestrial life: on Mars, on the moons of Saturn and Jupiter or on extrasolar planets (beyond our Solar System). As well as being essential for the emergence of life on Earth, water is abundant in the cosmos. This wonderfully universal solvent — almost every substance can dissolve in it — can transport such chemicals as phosphates into and out of cells.
Churchill then defines what is known today as the habitable zone — that narrow 'Goldilocks' region around a star that is neither too cold nor too hot, so that liquid water may exist on the surface of a rocky planet. He writes that life can survive only in regions “between a few degrees of frost and the boiling point of water”. He explains how Earth's temperature is fixed by its distance from the Sun. Churchill also considers the ability of a planet to retain its atmosphere, explaining that the hotter a gas is, the faster its molecules are moving and the more easily they can escape. Consequently, stronger gravity is necessary to trap gas on a planet in the long term.
Taking all these elements together, he concludes that Mars and Venus are the only places in the Solar System other than Earth that could harbour life. He eliminates the outer planets (too cold); Mercury (too hot on the sunny side and too cold on the other); and the Moon and asteroids (their gravities are too weak to trap atmospheres).
Churchill began his essay not long after the 1938 US broadcast of the radio drama The War of The Worlds (an adaptation of H. G. Wells's 1898 story) had generated 'Mars fever' in the media. Speculation over the existence of life on the red planet had been going on since the late nineteenth century. In 1877, Italian astronomer Giovanni Schiaparelli described seeing linear marks on Mars (canali; mistranslated as canals) that were thought to be constructed by some civilization. These turned out to be optical illusions but the idea of Martians stuck. Science-fiction stories abounded, culminating with Ray Bradbury's The Martian Chronicles (Doubleday, 1950), published in the United Kingdom as The Silver Locusts (Rupert Hart-Davis, 1951).
Churchill's essay next assesses the probability that other stars host planets. He reasons that “the sun is merely one star in our galaxy, which contains several thousand millions of others”. Churchill assumes that planets are formed from the gas that is torn off a star when another star passes close to it — a model suggested by astrophysicist James Jeans in 1917, which has since been ruled out. He infers that, because such close encounters are rare, “our sun may be indeed exceptional, and possibly unique”.
Now Churchill shines. With the healthy scepticism of a scientist, he writes: “But this speculation depends upon the hypothesis that planets were formed in this way. Perhaps they were not. We know there are millions of double stars, and if they could be formed, why not planetary systems?”
Indeed, the present-day theory of planet formation — the build up of a rocky planet's core by the accretion of many small bodies — is very different from Jeans's. Churchill writes: “I am not sufficiently conceited to think that my sun is the only one with a family of planets.”
Thus, he concludes, a large fraction of extrasolar planets “will be the right size to keep on their surface water and possibly an atmosphere of some sort” and some will be “at the proper distance from their parent sun to maintain a suitable temperature”.
This was decades before the discoveries of thousands of extrasolar planets began in the 1990s, and years before astronomer Frank Drake presented his probabilistic argument for the rarity of communicating civilizations in the cosmos in 1961. Extrapolating data from the Kepler Space Observatory suggests that the Milky Way probably contains more than a billion Earth-size planets in the habitable zones of stars that are the size of the Sun or smaller3.
Reflecting on the enormous distances involved, Churchill concludes that we may never know whether such planets “house living creatures, or even plants”.
Churchill sees great opportunity for exploration in 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 or Mars,” he writes. By contrast, he notes, interstellar travel and communication are intrinsically difficult. He points out that it would take light some five years to travel even to the nearest star and back, adding that the nearest large spiral galaxy to the Milky Way (Andromeda — one of the “spiral nebulae”, as he calls them) is more than several hundred thousand times as far away as the nearest stars.
The essay finishes eagerly: “with hundreds of thousands of nebulae, each containing thousands of millions of suns, the odds are enormous that there must be immense numbers which possess planets whose circumstances would not render life impossible.” Here Churchill shows that he was familiar with the findings of astronomer Edwin Hubble in the late 1920s and early 1930s, who discovered that there are many galaxies beyond the Milky Way (about 2 trillion, according to a recent estimate4).
Taking a bleaker turn that reflects his times, Churchill adds: “I, for one, am not so immensely impressed by the success we are making of our civilization 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.”
Almost 80 years later, the question that obsessed Churchill is one of the hottest topics of scientific research. Searches for signs of subsurface life on Mars are ongoing. Simulations of Venus's climate hint that it may once have been habitable5. Astronomers believe that, in a few decades, we will discover some biological signatures of present or past life in the atmospheres of extrasolar planets, or at least be able to constrain its rarity6.
Churchill's essay is testament to how he saw the fruits of science and technology as essential for society's development. When he helped to establish Churchill College at the University of Cambridge, UK, in 1958, he wrote7: “It is only by leading mankind in the discovery of new worlds of science and engineering that we shall hold our position and continue to earn our livelihood.”
Yet he was also concerned that without understanding the humanities, scientists might operate in a moral vacuum. “We need scientists in the world but not a world of scientists,” he said8. In order for science to be “the servant and not the master of man”, he felt that appropriate policies that drew on humanistic values must be in place. As he put it in a 1949 address to the Massachusetts Institute of Technology's convocation: “If, with all the resources of modern science, we find ourselves unable to avert world famine, we shall all be to blame.”
Churchill was a science enthusiast and advocate, but he also contemplated important scientific questions in the context of human values. Particularly given today's political landscape, elected leaders should heed Churchill's example: appoint permanent science advisers and make good use of them.
Kurt Hutton/Picture Post/Getty
Winston Churchill at his desk in 1939: a prolific writer, he covered scientific topics as diverse as evolution and fusion power.
An image taken by the Mars Reconnaissance Orbiter of the Martian surface, where the search for water is ongoing.
“Churchill sees great opportunity for exploration in the Solar System.”
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Winston Churchill was known for his leadership during World War II, but a newfound essay on alien life reveals another side of him, one that was deeply curious about the universe.
"I, for one, am not so immensely impressed by the success we are making of our civilization here that I am prepared to think we are the only spot in this immense universe which contains living, thinking creatures," he wrote in the newly uncovered essay, "or that we are the highest type of mental and physical development which has ever appeared in the vast compass of space and time."
Besides being prime minister of the United Kingdom during the tumultuous years of World War II, the British statesman was also a prolific writer and proponent of science. In fact, he was the first prime minister to have a science advisor. Those traits converged in the newfound 11-page essay about the search for alien life, discovered at the Churchill Museum in Fulton, Missouri. It was first written in 1939 and was slightly revised in the late 1950s. [5 Bold Claims of Alien Life]The museum's director, Timothy Riley, showed the document to astrophysicist Mario Livio, who described the work and Churchill's approach to science in an article published today (Feb. 15) in the journal Nature. Churchill's essay was titled "Are We Alone in the Universe?".
"I was amazed to see the title of this article, first of all," Livio, head of the Institute Science Division at the Space Telescope Science Institute, told Space.com. "And then I read it and was even more astonished, because I saw that this great politician is musing about a real scientific topic, an intriguing scientific topic, [and] he is reasoning about this in the same way that a scientist today would go about it."
Churchill was not a scientist, and when the politician composed the essay, Europe was on the brink of war, Livio said.
"And yet, at that time, he finds the time to contemplate such issues and think about things so clearly," Livio added.
Evaluating the likelihood of life
In the essay, Churchill first set out to define life, characterizing the most important quality as the ability to reproduce. He chose to consider "comparatively highly organized life," which Livio said is probably multicellular life. Churchill likely did this to avoid ambiguity for things like viruses, which are able to replicate but exhibit other characteristics that aren't terribly lifelike, Livio said.
Then, Churchill discussed where to look for life: in places with liquid water (or where liquid water can persist, which is what scientists now call the "habitable zone" around stars).
"Then, he says, OK, once we've defined life, what are the necessary ingredients for life to exist? And he identifies liquid water as one such ingredient," Livio said. "And that's exactly what we do today. Our searches for life in the universe today are primarily guided by liquid water."
In his essay, Churchill considered the solar system, deciding that only Mars and Venus could have fulfilled those conditions. The outer planets are too cold, Mercury is too hot on one side and too cold on the other, and the moon and asteroids have gravity too weak to trap the atmosphere, Livio wrote, summarizing Churchill's argument.
Then, Churchill discussed the possibility of planets outside the solar system — exoplanets — which had not yet been discovered. The model he considered, described by astrophysicist James Jean in 1917, predicted that planetary formation is very unlikely to occur. (The theory, which proved incorrect, described planets forming by the gas torn from a star when another star passes by it.)
"But the beautiful thing is, then he says, But wait! Maybe this theory is wrong! Why should we think that this theory is correct?" Livio said. Churchill added that the abundance of double stars suggests that planetary systems could form commonly.
In the article, Livio quoted Churchill's essay: "I am not sufficiently conceited to think that my sun is the only one with a family of planets." Churchill went on to posit that a large fraction of those planets would be the right size to keep water on their surface and maybe an atmosphere, and that some would be at the right distance from their stars to maintain a life-friendly temperature.
"This chain of logic is astounding, in my opinion, for a politician," Livio said. [The Search for Extraterrestrial Intelligence Explained (Infographic)]
Churchill and science
Livio said Churchill saw value in science, but the statesman took a nuanced approach. He understood that science was necessary to win the war effort, but also established an atmosphere in which science was important in its own right, and he wanted it to be used to improve the world.
"As a result of that, in the 1950s, came all these great discoveries," Livio said, citing milestones like finding the structure of DNA and developing radio astronomy, which stemmed from work on radar. "Once you generate the framework and the infrastructure for science to thrive, then a variety of discoveries come."
But Churchill also emphasized that science should work to advance humanity, Livio said.
"Later in life, he also understood that one cannot do the science in what he would call a moral vacuum," Livio said. "You need to embed all the scientific research and discoveries also in the context of human values, and an understanding of the human condition."
Livio emphasized that today, science has serious problems to address, particularly regarding food resources, climate change and disease. Churchill's approach to science is necessary, Livio said.
"All of those [concerns] require serious scientific input, so there must be the mechanisms in place to get that scientific input, and the correct scientific input — which means science advisors at high levels, and involvement of scientists in a variety of decisions concerning some of those challenges," Livio said. "It certainly doesn't help to shun sciences; some of these problems can turn into disasters if nothing is done."
As for the likelihood of life on other planets, over the past 20 years, scientists have discovered thousands of planets orbiting other stars and have made large strides in determining these worlds' characteristics remotely. But researchers have yet to discover definitive signs of life elsewhere in the universe, or to visit other planets in person to hunt for life. However, Churchill didn't want to put bounds on what advancing science or technology might bring, Livio said.
"When he discussed the possibility of traveling to other planets and things like that, he says, well maybe this isn't possible today but, he says, 'It is rash to set limits to the progress of science,'" Livio said. "Things that are not possible today, you shouldn't think that they would not be possible in the future."
Email Sarah Lewin at email@example.com or follow her @SarahExplains. Follow us @Spacedotcom, Facebook and Google+. Original article on Space.com.
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