Thursday, March 31, 2011

Space Travel: Science Fiction's Biggest Underachiever

In 1968, futurist Arthur C. Clarke wrote 2001: A Space Odyssey, which quickly became one of the most popular science fiction novels of the 20th century. In Clarke’s vision of tomorrow, mankind in 2001 would have ring-shaped space stations that rotate to provide gravity, permanent lunar colonies which people routinely visit for business meetings, and fully-functional (if evil) artificial intelligence. The zeitgeist of the late 1960s, at the height of the space race, was one of unbridled optimism in the future of space travel. Just two years before Clarke’s novel was published, Star Trek had first premiered. It seemed inevitable that we were destined for the stars.

Looking at the world around us, it is easy to be disappointed at how space travel has progressed. The world today looks nothing like Star Trek, or even 2001: A Space Odyssey. After the Apollo missions ended in 1972, something strange happened that few futurists anticipated: mankind stopped exploring space, and turned inward to focus on problems at home. NASA’s budget was slashed. To the extent that space exploration progressed, it was done almost exclusively by robots rather than manned missions. If we were able to go back in time to the late 1960s and tell people that we would indeed have a permanent space settlement today, they would almost certainly envision something far grander than the International Space Station.

Why were the space enthusiasts wrong? The biggest obstacle has been political, not technological. In my opinion, political trends are much more difficult to predict than technological trends. From a 1968 perspective, the US and USSR were locked in a Cold War that would soon extend far above the earth’s surface. It was much easier to forecast the trends in space technology than to predict that the USSR would throw in the towel on the space race by the mid-1970s, and cease to exist at all soon thereafter. With the collapse of the USSR, the impetus for a space race has disappeared. No nation is willing to spend large sums of money exploring space without the threat of a rival beating them to it.

In light of this political reality, the exploration of other worlds seems to be permanently on hold. I do not envision this changing any time in the next couple decades. Although President George W. Bush called for the United States to return to the moon by 2020 and NASA stated that a permanent manned lunar base would be operational by 2024, it is highly unlikely that these goals will be fulfilled. The US is simply not motivated to do so.

Additionally, the economics of space travel have changed significantly since the Apollo missions. Due to advances in computer technology, it is now much cheaper to send robots to explore other worlds than it is to send human astronauts. Robots don’t need food, water, and air to keep them alive, and don’t need a return trip to earth. They can do almost everything a human astronaut can do, and can wirelessly transmit the data back home. Indeed, NASA has had some great achievements exploring our solar system, but the pioneers have all been robots.

It is possible that the private sector will be able to pick up part of the slack left by governments. SpaceShipOne, the first privately-owned spacecraft, claimed the Ansari X Prize in 2004. However, private space travel will never progress beyond orbital missions for super-rich adventure-seekers until there are some fundamental breakthroughs in rocketry. It currently costs $10,000 to send one pound into orbit, because rocket fuel itself is responsible for 90% of the weight of a rocket. As long as fossil fuels are the standard propulsion technology, human space travel will continue to be unaffordable for most people. Futurist and theoretical physicist Michio Kaku suggests that rockets could be powered by lasers instead of by fuel. Lasers on earth could fire at a water tank, vaporizing the water and propelling a rocket upward. Since the thrust would come from the ground instead of the rocket itself, it would eliminate the need for fuel and make rocketry 10 times more efficient.

Although this technique has been demonstrated to work in prototypes, it will be a long time before it can be applied to something as large as a rocket. Although many emerging technologies few people have imagined will suddenly take us by surprise, I think that space travel is something that will continue to disappoint us for many years.


As of 2025 – No human being has set foot on the moon since the Apollo missions.

As of 2035 – No human being has ever set foot on Mars.


  1. Have you read Charles Stross' analysis of interstellar space travel? It's a sci-fi writer's commentary on why it is that we had better be content with Earth for the long term. It's kind of depressing in a way, but...

  2. Nick,
    That's a very interesting article. I definitely agree with most of what he says. The technical problems with space colonization are enormous, and there's not much reason to go there in the short- to medium-term.

    Maybe in the distant future we'll have some solutions like new propulsion technologies or ways to terraform the surface of other planets to meet our needs, but I agree with him that it won't happen anytime soon.