2001: A Space Odyssey by Arthur C. Clarke (1968)


It all started with a short story Clarke wrote for a BBC competition in 1948 when he was just 21, and titled The Sentinel. It was eventually published in 1951 under the title Sentinel of Eternity.

13 years later, after completing Dr. Strangelove in 1964, American movie director Stanley Kubrick turned his thoughts to making a film with a science fiction subject. Someone suggested Clarke as a source and collaborator, and when they met, later in 1964, they got on well and formed a good working relationship.

Neither of them could have predicted that it would take them four long years of brainstorming, viewing and reading hundreds of sci-fi movies and stories, and then honing and refining the narrative, to develop the screenplay which became the film 2001: A Space Odyssey, released in 1968 and one of the most influential movies of all time.

The original plan had been to develop the story as a novel first, then turn it into a screenplay, then into the film, but the process ended up being more complex than that. The novel ended up being written mostly by Clarke, while Kubrick’s screenplay departed from it in significant ways.

The most obvious difference is that the book is full of Clarke’s sensible, down-to-earth, practical explanations of all or most of the science involved. It explains things. From the kick-start given to human evolution by the mysterious monolith through to Bowman’s journey through the Star Gate, Clarke explains and contextualises.

This is all in stark contrast with the film which Kubrick made as cryptic as possible by reducing dialogue to an absolute minimum, and eliminating all explanation. Kubrick is quoted as saying that the film was ‘basically a visual, nonverbal experience’, something which a novel, by definition, can not be.

The novel

The novel is divided into 47 short snappy chapters, themselves grouped into six sections.

1. Primeval Night

The basic storyline is reasonably clear. A million years ago an alien artefact appears on earth, materialising in Africa, in the territory of a small group of proto-human man-apes. Clarke describes their wretched condition in the hot parched Africa of the time, permanently bordering on starvation, watered only by a muddy streamlet, dying of malnutrition and weakness or of old age at 30, completely at the mercy of predators like a local leopard.

The object – 15 feet high and a yard wide – appears from nowhere. When the ape-men lumber past it on the way to their foraging ground, it becomes active and literally puts ideas into their heads. It takes possession of members of the group in turn and forces them to tie knots in grass, to touch their fingers together, to perform basic physical IQ tests. Then, crucially, it patiently shows them how to use stones and the bones of dead animals as tools.

The result is that they a) kill and eat a wild pig, the first meat ever eaten by the ape-men b) surround and kill the leopard that’s been menacing the tribe c) use these skills to bludgeon the leader of ‘the Others’, a smaller weaker tribe on the other side of the stream. In other words, the alien artefact has intervened decisively in the course of evolution to set man on his course to becoming a planet-wide animal killer and tool maker.

In the kind of fast-forward review section which books can do and movies can’t, Clarke then skates over the hundreds of thousands of years of evolution which follow, during which human’s teeth became smaller, their snouts less prominent, giving them the ability to make more precise sounds through their vocal cords – the beginnings of speech – how ice ages swept over the world killing most human species but leaving the survivors tougher, more flexible, more intelligent, and then the discovery of fire, of cooking, a widening of diet and survival strategies. And then to the recent past, to the Stone, Iron and Bronze ages, and sweeping right past the present to the near future and the age of space travel.

Compare and contrast the movie where all this is conveyed by the famous cut from a bone thrown into the air by an ape-man which is half way through its parabola when it turns into a space ship in orbit round earth. Prose describes, film dazzles.

2. T.M.A.-1

It is 2001. Humanity has built space stations in orbit around the earth, and a sizeable base on the moon. Dr Heywood Floyd, retired astrophysicist, is taking the journey from the American launch base in Florida, to dock with the orbiting space station, and then on to the moon base.

Clarke in his thorough, some might say pedantic, way, leaves no aspect of the trip undescribed and unexplained. How the rocket launcher works, how to prepare for blast-off, how the space station maintains a sort of gravity by rotating slowly, the precise workings of its space toilets (yes), the transfer to the shuttle down to the moon: Clarke loses no opportunity to mansplain every element of the journey, including some favourite facts familiar from the other stories I’ve read: the difference between weight and mass; how centrifugal spin creates increased gravity the further you are from the axis of spin; ‘the moon’s strangely close horizon’ (p.74); how damaging an alien artifact would be the work of a ‘barbarian’ (a thought repeated several times in Rama).

Two other features emerge. Clarke’s protagonists are always men, and they are almost always married men, keen to keep in touch with their wives, using videophones. In other words they’re not valiant young bucks as per space operas. It’s another element in the practical, level-headed approach of Clarke’s worldview.

Secondly, Clarke is a great one for meetingsChildhood’s End‘s middle sections rotate around the Secretary General of the United Nations who has a busy schedule of meetings, from his weekly conference with the Overlords to his meetings with the head of the Freedom league, and his discussion of issues arising with his number two.

A Fall of Moondust features hurried conferences between the top officials on the moon. The narrative of Rendezvous with Rama is punctuated all the way through by meetings of the committee made up of with representatives from the inhabited planets, who discuss the issues arising but also get on each other’s nerves, bicker and argue, grandstand, storm out and so on. His fondness for the set meeting, with a secretary taking notes and a chairman struggling to bring everyone into line, is another of the features which makes Clarke’s narratives seem so reassuringly mundane and rooted in reality.

Same here. Floyd is flying to the moon to take part in a top secret, high-level meeting of moon officials. He opens the meeting by conveying the President’s greetings and thanks (as people so often do in sci-fi thrillers like this).

In brief: a routine survey of the moon has turned up a magnetic anomaly in the huge crater named Tycho. (The anomaly has been prosaically named Tycho Magnetic Anomaly One – hence the section title T.M.A.-1.) When the surveyors dug down they revealed an object, perfectly smooth and perfectly black, eleven foot high, five foot wide and one and a quarter foot deep. Elementary geology has shown that the object was buried there three million years ago.

After a briefing with the moon team Floyd goes out by lunar tractor to the excavation site where digging has now fully revealed the artifact. Floyd and some others go down into the excavation and walk round the strange object which seems to absorb light. The sun is rising (the moon turns on its axis once in fourteen days) and as its light falls onto the artifact – for probably the first time in millions of years – Floyd and the others are almost deafened by five intense burst of screeching sound which cut through their radio communications.

Millions of miles away in space, deep space monitors, orbiters round Mars, a probe launched to Pluto – all record and measure an unusual burst of energy streaking across the solar system… Cut to:

3. Between Planets

David Bowman is captain of the spaceship Discovery. It was built to transport two live passengers (himself and Frank Poole) and three others in suspended animation, to Jupiter. But two years into the project the TMA-1 discovery was made and plans were changed. Now the ship is intending to use the gravity of Jupiter as a sling to propel it on towards Saturn. When they enter Saturn’s orbit the three sleeping crew members (nicknamed ‘hibernauts’) will be woken and the full team of five will have 100 days to study the super-massive gas giant, before all the crew re-enter hibernation, and wait to be picked up by Discovery II, still under construction.

Clarke is characteristically thorough in describing just about every aspect of deep space travel you could imagine, the weightlessness, the scientific reality of hibernation, the food, what the earth looks like seen from several million miles away. He gives an hour by hour rundown of Bowman and Poole’s 24-hour schedule, which is every bit as boring as the thing itself. He describes in minute astronomical detail the experience of flying through the asteroid belt and on among the moons of Jupiter, watching the sun ‘set’ behind it and other strange and haunting astronomical phenomena which no one has seen.

Then there’s a sequence in which he imagines the pictures sent back by a probe which Bowman and Poole send down into Jupiter’s atmosphere: fantastic but completely plausible imaginings. After reporting what they see from the ship, and the images relayed by the probe, the couple have done with Jupiter and set their faces to Saturn, some three months and four hundred million miles away.

The awesomeness doesn’t come from the special effects and canny use of classical music, as per the movie, but from straightforward statement of the scientific and technical facts – such as that they are now 700 million miles from earth (p.131), travelling at a speed of over one hundred thousand miles an hour (p.114).

4. Abyss

All activities on the Discovery are run or monitored by the ship’s onboard computer, HAL 9000, ‘the brain and nervous system of the ship’ (p.97). HAL stands for Heuristically programmed ALgorithmic computer. It is the most advanced form of the self-teaching neural network which, Clarke predicts, will have been discovered in the 1980s.

HAL has a nervous breakdown. He predicts the failure of the unit which keeps the radio antenna pointed at earth. Poole goes out in one of the nine-foot space pods, anchors to the side of the ship, then does a short space walk in a space suit, unbolts the failing unit and replaces it.

But back inside the ship the automatic testing devices find nothing wrong with the unit. When a puzzled Bowman and Poole report all this back to earth, Mission Control come back with the possibility that the HAL 9000 unit might have made a mistake.

Poole and Bowman ponder the terrifying possibility that the computer which is running the whole mission might be failing. Mission Control send a further message saying the two HAL 9000 units they are using to replicate all aspects of the mission back home both now recommend disconnecting the HAL computer aboard the Discovery. Earth is just in the middle of starting to give details about how to disconnect HAL when the radio antenna unit really does fail and contact with earth is broken. Coincidence? Bear in mind that HAL has been monitoring all of these conversations…

After discussing the possibility that HAL was right all along about the unit and that they are being paranoid  about him, Poole goes out for another space walk and repair. He’s in the middle of installing the new unit when he sees something out the corner of his eye, looks up and sees the pod suddenly shooting straight at him. With no time to take evasive action Poole is crushed by the ten-ton pod, his space suit ruptured, he is dead in seconds. Through an observation window Bowman sees first the pod and then Bowman’s body fly past and away from the ship.

Bowman confronts Hal, who calmly regrets that there has been accident. Mission orders demand that Bowman now revive one of the three hibernators since there must always be two people active on the ship. HAL argues with Bowman, saying this won’t be necessary, by which stage Bowman realises there is something seriously wrong. He threatens to disconnect HAL at which point the computer abruptly relents. Bowman makes his way to the three hibernator pods and has just started to revive the next in line of command, Whitehead when… HAL opens both doors of the ship’s airlock and all the air starts to flood out into space. In the seconds before the ship becomes a vacuum, Bowman manages to make it to an emergency alcove, seal himself in, jets it up with oxygen and climb into the spacesuit kept there for just such emergencies.

Having calmed down from the shock, Bowman secures his suit then climbs out, makes his way through the empty, freezing, lifeless ship to the sealed room where HAL’s circuits are stored and powered and… systematically removes all the ‘higher’ functions which permit HAL to ‘think’, leaving only the circuits which control the ship’s core functions. HAL asks him not to and, exactly as in the film, reverts to his ‘childhood’, his earliest learning session, finally singing the song ‘Daisy, Daisy, give me your answer do.’

Hours later Bowman makes a journey in the remaining pod to fix the radio antenna, then returns, closes the airlock doors and slowly restores atmosphere to the ship. Then contacts earth. And it is only now that Dr Floyd, summoned by Mission Control, tells him the true reason for the mission. Tells him about the artifact in Tycho crater. Tells him that it emitted some form of energy which all our monitors indicate was targeted at Saturn, specifically at one of its many moon, Japetus. That is what the Discovery has been sent to investigate.

And it is only in the book that Clarke is able to tell us why HAL went mad. It was the conflict between a) the demand to be at all times totally honest, open and supportive of his human crew and b) the command to keep the true purpose of the mission secret, which led HAL to have a nervous breakdown, and decide to remove one half of the conflict i.e. the human passengers, which would allow him to complete the second half, the mission to Saturn, in perfect peace of ‘mind’.

5. The Moons of Saturn

So now Bowman properly understands the mission, goes about fixing the Discovery, is in constant contact with earth and Clarke gives us an interesting chapter pondering the meaning of the sentinel and what it could have been saying. Was it a warning to its makers, or a message to invade? Where was the message sent? To beings which had evolved on or near Saturn (impossible, according to all the astrophysicists)? Or to somewhere beyond the solar system itself? In which case how could anything have travelled that far, if Einstein is correct and nothing can travel faster than light?

These last two chapters have vastly more factual information in than the movie. What the movie does without any dialogue, with stunning images and eerie music, Clarke does with his clear authoritative factual explanations. He gives us detailed descriptions of the rings of Saturn from close up, along with meticulously calculated information about perihelions and aphelions and the challenges of getting into orbit around Saturn.

But amid all this factuality is the stunning imaginative notion that the moon of Saturn, Japetus, bears on its surface a vast white eye shape at the centre of which stands an enormous copy of the TMA artifact, a huge jet black monolith maybe a mile high.

Which leads into a chapter describing the race which placed it there, which had evolved enough to develop planet travel, then space travel, then moved their minds into artificial machines and then into lattices of light which could spread across space and so, finally, into what humans would call spirit, free from time and space, at one with the universe.

It is this enormous artifact which Bowman now radios Mission Control he is about to go down to in the pod and explore.

6. Through the Star Gate

In the movie this section becomes a non-verbal experience of amazing visual effects. A book can’t do that. It has to describe and, being Clarke, can’t help also explaining, at length, what is going on.

Thus the book is much clearer and more comprehensible about what happens in this final section. Bowman guides his pod down towards the enormous artifact and is planning to land on its broad ‘top’ when, abruptly it turns from being an object sticking out towards him into a gate or cave or tunnel leading directly through the moon it’s situated on. He has just time to make one last comment to Mission Control before the pod is sucked through into the star gate and his adventure begins.

He travels along some faster-than-light portal, watching space bend around him and time slow down to a halt. He emerges into a place where the stars are more static and, looking back, sees a planet with a flat face pockmarked by black holes like the one he’s just come through, and what, when he looks closely, seems to be the wreck of a metal spaceship. He realises this must be a kind of terminal for spaceships between voyages, then the pod slowly is sucked back into one of the holes.

More faster than light travelling, then he emerges into a completely unknown configuration of stars, red dwarfs, sun clusters, the pod slows to a halt and comes to rest in… a hotel room.

Terrified, Bowman makes all the necessary checks, discovers it has earth gravity and atmosphere, gets out of the pod, takes off his spacesuit, has a shower and shave, dresses in one of the suits of clothes provided in a wardrobe, checks out the food in the fridge, or in tins or boxes of cereal.

But he discovers that the books on the coffee table have no insides, the food inside the containers is all the same blue sludge. When he lies on the bed flicking through the channels on the TV he stumbles across a soap opera which is set in this very same hotel room he is lying in. Suddenly he understands. The sentinel, after being unearthed, monitored all radio and TV signals from earth and signalled them to the Japetus relay station and on here – wherever ‘here’ is – and used them as a basis to create a ‘friendly’ environment for their human visitor.

Bowman falls asleep on the bed and while he sleeps goes back in time, recapitulating his whole life. And part of him is aware that all the information of his entire life is being stripped from his mind and transferred to a lattice of light, the same mechanism which Clarke explained earlier in the novel, was the invention of the race which created the sentinel. Back, back, back his life reels until – in a miraculous moment – the room contains a baby, which opens its mouth to utter its first cry.

The crystal monolith appears, white lights flashing and fleering within its surface, as we saw them do when it first taught the man-apes how to use tools and eat meat, all those hundreds of thousands of years ago.

Now it is probing and instructing the consciousness of Bowman, guiding him towards the next phase. The monolith disappears. The being that was Bowman understands, understands its meaning, understands how to travel through space far faster than the primitive star gate he came here by. All he needs is to focus his ‘mind’ and he is there.

For a moment he is terrified by the immensity of space and the infinity of the future, but then realises he is not alone, becomes aware of some force supporting and sustaining him, the guiders.

Using thought alone he becomes present back in the solar system he came from. Looking down he becomes aware of alarm bells ringing and flotillas of intercontinental missiles hurtling across continents to destroy each other. He has arrived just as a nuclear war was beginning. Preferring an uncluttered sky, he abolishes all the missiles with his will.


But he would think of something.

And those are the final sentences of the book.


Like Childhood’s End the book proceeds from fairly understandable beginnings to a mind-boggling, universe-wide ending, carrying the reader step by step through what feels almost – if you let it take control of your imagination – like a religious experience.

Eliot Fremont-Smith reviewing the book in the New York Times, commented that it was ‘a fantasy by a master who is as deft at generating accelerating, almost painful suspense as he is knowledgeable and accurate (and fascinating) about the technical and human details of space flight and exploration.’

That strikes me as being a perfect summation of Clarke’s appeal – the combination of strict technical accuracy, with surprisingly effective levels of suspense and revelation.

His concern for imagining the impact of tiny details reminds me of H.G. Wells. In the Asimov and Blish stories I’ve been reading, if there’s a detail or the protagonist notices something, it will almost certainly turn out to be important to the plot. Clarke is the direct opposite. Like Wells his stories are full of little details whose sole purpose is to give the narrative a terrific sense of verisimilitude.

To pick one from hundreds, I was struck by the way that Dr Floyd finds wearing a spacesuit on the surface of the moon reassuring. Why? Because its extra weight and stiffness counter the one sixth gravity of the moon, and so subconsciously remind him of the gravity on earth. Knowing that fact, and then deploying it in order to describe the slight but detectable impact it has on one of his characters’ moods,strikes me as typical Clarke.

Hundreds of other tiny but careful thinkings-though of the situations which his characters find themselves in, bring them home and make them real.

And as to suspense, Clarke is a great fan of the simple but straightforward technique of ending chapters with a threat of disaster. E.g. after his first space walk Poole returns to the ship confident that he has fixed the problem.

In this, however, he was sadly mistaken. (p.140)

Although this is pretty cheesy, it still works. He is a master of suspense. The three other novels I’ve read by him are all thrilling, and even though I’ve seen the movie umpteen times and so totally know the plot, reading Clarke’s book I was still scared when HAL started malfunctioning, and found Bowman’s struggle to disconnect him thrilling and moving.

As to the final section, when Bowman travels through the star gate and is transformed into a new form of life, of celestial consciousness, if you surrender to the story the experience is quite mind-boggling.

It also explains a lot – and makes much more comprehensible – what is left to implication and special effects in the movie.

Forlorn predictions

Clarke expects that by 2001:

  • there will be a permanent colony on the moon, where couples will be having and bringing up children destined never to visit the earth
  • there will also be a colony on Mars
  • there will be a ‘plasma drive’ which allows for super-fast spaceship travel to other planets

I predict there will never be a colony on the moon, let alone Mars, and no ‘plasma drive’.

On the plus side, Clarke predicts that by 2001 there will be a catastrophic six billion people on earth, which will result in starvation, and food preservation policies even in the rich West. In the event there were some 6.2 billion people alive in 2001, but although there were the usual areas of famine in the world, there wasn’t the really widespread food shortages Clarke predicted.

The future has turned out to be much more human, mundane, troubled and earth-bound than Clarke and his generation expected.



All references are to the 2011 reprint of the 1998 Orbit paperback edition of 2001: A Space Odyssey by Arthur C. Clarke, first published by Hutchinson in 1968.

Related links

Arthur C. Clarke reviews

  • Childhood’s End (1953) a thrilling narrative involving the ‘Overlords’ who arrive from space to supervise mankind’s transition to the next stage in its evolution
  • A Fall of Moondust (1961) a pleasure tourbus on the moon is sucked down into a sink of moondust, sparking a race against time to rescue the trapped crew and passengers
  • 2001: A Space Odyssey (1968) a panoramic narrative which starts with aliens stimulating evolution among the first ape-men and ends with a spaceman being transformed into galactic consciousness
  • Rendezvous With Rama (1973) it is 2031 and when an alien object, a cylinder 15 k wide by 50 k long, enters the solar system, and Commander Norton and the crew of Endeavour are sent to explore it

Other science fiction reviews


1898 The War of the Worlds – the Martians invade earth




1932 Brave New World by Aldous Huxley






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