Emerging Technology from the arXiv

A View from Emerging Technology from the arXiv

Can Humanity Design a Probe Capable of Visiting Another Star?

Project Icarus is an ambitious plan to reassess our ability to send a spacecraft to another star. But is it any more than science fiction?

  • May 25, 2010

Until recently, planetary geologists had only a handful of subjects to study. The discovery of exoplanets has changed all that, however. The number of known planets orbiting other stars now approaches 500 and few astronomers seriously doubt that an Earth-like body will turn up somewhere soon.

When that happens, we’ll want to study it in unprecedented detail. We’ll want to know it’s mass, temperature, atmospheric composition, it’s colour, whether it has seas and continents and if so whether these support life, perhaps even of the intelligent kind. But above all we’ll want to know whether we can visit this place.

Such a trip will not be easy but it may not be entirely impossible. In fact, rocket scientists have dreamed up various plans for interplanetary probes. One of the more famous was Project Daedalus, a 1970s plan by the British Interplanetary Society for a nuclear-powered spacecraft capable of visiting Barnard’s Star some 6 light years away within a human lifetime.

Today, the British Interplanetary Society and another organisation called the Tau Zero Foundation have posted plans on the arXiv to redesign Daedalus in the light of the 30 years of advances that have taken place since the original. The new plan is called Project Icarus. (In Greek mythology, Icarus was the son of Daedalus who died after flying too close to the Sun and melting the wax that held his wings together.)

What’s interesting about Icarus is that it could be an interesting measure of the progress in nuclear propulsion technology in the 30 years since Daedalus was conceived.

Back then the idea was to fuse deuterium and helium-3 in small pellets by heating them with a powerful electron beam. The resulting explosion, repeated 250 times a second, should accelerate the craft to 12 per cent of the speed of light giving a journey time of 50 years.

The challenges with such a scheme are manifold. Building a propulsion system that would work for 50 years in these extreme conditions isn’t entirely straightforward, the fuel for such a journey would have to be mined from the atmospheres of the gas giants and then there is the problem of slowing down at the other end, which the Daedalus team solved by making the mission a flyby.

The Icarus team plan to revisit all these problems to determine whether they are any more achievable than they were 30 years ago.

One of the important design limitation that Daedalus sought to meet was that the flight time should be less than a human lifetime: which they arguably met with a 50-year journey time.

But an equally important goal is to ensure that the design challenges are addressable within the working lifetime of the scientists and engineers on the project. That’s a limitation that Daedalus obviously failed to meet.

Can Icarus be conceived with such a criteria in place? If not, it is little more than science fiction: who would pay for a project they know they can’t finish?

But if it can, it’s just possible that we’ll send a probe to an Earth-like planet in the foreseeable future. When and if we find one.

Ref: arxiv.org/abs/1005.3833: PROJECT ICARUS: Son of Daedalus Flying Closer to Another Star

Tech Obsessive?
Become an Insider to get the story behind the story — and before anyone else.
Subscribe today

Uh oh–you've read all five of your free articles for this month.

Insider Premium

$179.95/yr US PRICE

Want more award-winning journalism? Subscribe and become an Insider.

  • Insider Premium {! insider.prices.premium !}*

    {! insider.display.menuOptionsLabel !}

    Our award winning magazine, unlimited access to our story archive, special discounts to MIT Technology Review Events, and exclusive content.

    See details+

    What's Included

    Bimonthly home delivery and unlimited 24/7 access to MIT Technology Review’s website.

    The Download. Our daily newsletter of what's important in technology and innovation.

    Access to the Magazine archive. Over 24,000 articles going back to 1899 at your fingertips.

    Special Discounts to select partner offerings

    Discount to MIT Technology Review events

    Ad-free web experience

    First Look. Exclusive early access to stories.

    Insider Conversations. Join in and ask questions as our editors talk to innovators from around the world.

  • Insider Plus {! insider.prices.plus !}* Best Value

    {! insider.display.menuOptionsLabel !}

    Everything included in Insider Basic, plus ad-free web experience, select discounts to partner offerings and MIT Technology Review events

    See details+

    What's Included

    Bimonthly home delivery and unlimited 24/7 access to MIT Technology Review’s website.

    The Download. Our daily newsletter of what's important in technology and innovation.

    Access to the Magazine archive. Over 24,000 articles going back to 1899 at your fingertips.

    Special Discounts to select partner offerings

    Discount to MIT Technology Review events

    Ad-free web experience

  • Insider Basic {! insider.prices.basic !}*

    {! insider.display.menuOptionsLabel !}

    Six issues of our award winning magazine and daily delivery of The Download, our newsletter of what’s important in technology and innovation.

    See details+

    What's Included

    Bimonthly home delivery and unlimited 24/7 access to MIT Technology Review’s website.

    The Download. Our daily newsletter of what's important in technology and innovation.

You've read of free articles this month.