Tiny submersible could search for life in Europa's ocean

June 11, 2013
Tiny submersible could search for life in Europa's ocean
Artist concept of a miniature submarine exploring under the ice. Credit: Jonas Jonsson | Angstrom Space Technology Centre of Uppsala University

One of the first visitors to Jupiter's icy moon of Europa could be a tiny submarine barely larger than two soda cans. The small craft might help strike the right balance between cost and capability for a robotic mission to look for alien life in the ocean beneath Europa's icy crust.

The idea for the incredible shrinking submarine originally came from NASA's Jet Propulsion Laboratory (JPL) in California and Uppsala University in Sweden. Such a vehicle would help keep mission costs low at a time when launching objects into space can still cost tens of thousands of dollars per kilogram. The mission concept also would have the advantage of only requiring a small drilled through the ice covering Europa's surface.

"What I think is exciting with this is to be able to explore previously inaccessible areas, to explore where no "man" has explored before," said Jonas Jonsson, an engineer now with Stinger Ghaffarian Technologies Inc. at NASA Ames Research Center in Moffett Field, Calif.

A paper study of the miniature submersible first came from NASA JPL researchers and Greger Thornell's Swedish team at Angstrom Space Technology Centre of Uppsala University. But Jonsson, an original member of the Swedish team, refined the submersible concept by building and testing parts of it for his Ph.D. thesis.

Scientists have gravitated toward the possibility of life on Europa ever since the mission first scouted out the icy moon from afar in 1979. Voyager 2's images and data hinted at the existence of a ocean lurking beneath Europa's icy surface—a huge body of water bigger than all of Earth's oceans combined.

From Earth to Europa

The existence of Arctic bacteria living under extreme frigid conditions on Earth suggests that life could possibly survive on icy Europa as well. But any life on Europa would only survive by hiding deep beneath Europa's crust—an icy covering about several kilometers (1 or 2 miles) in thickness—because of the radiation from Jupiter's magnetosphere bombarding the moon's surface.

Such intense radiation means a robotic lander digging a few feet into Europa's icy surface would likely find no organic traces or signs of life. Instead, a robotic mission might have better luck by going deep beneath the icy crust to study Europa's ocean.

Artist concept of a miniature submarine exploring under the ice. Credit: Jonas Jonsson | Angstrom Space Technology Centre of Uppsala University

Jonsson envisions the tiny submarine named Deeper Access, Deeper Understanding (DADU) taking on the Europa challenge in his 2012 Ph.D. thesis for Uppsala University in Sweden. The submarine could first get its feet wet by exploring similar watery environments on Earth where its small size could prove exceptionally useful.

"A mission to explore Lake Vostok in Antarctica, which is believed to have been isolated from the rest of the world by kilometers of thick ice for millions of years, would of course be the 'Holy Grail' mission, and a real proof of concept for a future mission to explore the oceans thought to exist underneath some of the frozen moons in the solar system, such as Europa and Enceladus," Jonsson explained.

A model of Europa's interior, including a global ocean. If a 100 kilometer-deep ocean existed below Europa’s ice shell, it would be 10 times deeper than any ocean on Earth and would contain twice as much water as Earth's oceans and rivers combined. Credit: NASA/JPL

How it works

The DADU submersible would use eight small thrusters to maneuver around the underwater world. A fiber optic tether would connect DADU to a surface lander or station—a way to recharge the submersible's lithium-ion batteries and allow for remote control by a human operator. On-board software would allow the submersible to automatically dodge obstacles or stay at a certain depth underwater.

The Swedish team created a series of miniaturized instruments and sensors for the dream submersible. DADU has a forward-looking camera with a small laser to capture high-resolution video and to gauge the distance, size and shape of underwater objects.

But a huge challenge came from shrinking everything down to incredibly small sizes. The sensor for measuring the conductivity, temperature and depth of water is smaller than a fingernail.

The submersible's sonar device alone could fit within a matchstick box, Jonsson said. Such a device uses piezoelectric material that can vibrate to create acoustic sonar pulses and read reflected pulses or vibrations as electrical signals.

Jonsson also tested the idea for the submersible's sampling device for collecting tiny life forms on Europa—a microfluidic device smaller than a human thumb with a special filter to trap tiny microorganisms.

Tiny submersible could search for life in Europa's ocean
Prototype miniature submersible. Credit: ÅSTC, Uppsala University

Making the future

The first prototypes of the DADU submersible were made of plastic from 3D printers that allowed the team to quickly "print" the digital designs into real objects. But they envision the real submersible being built from a titanium alloy in order to survive the harsh temperatures and intense pressures of underwater environments.

Next up, the Swedish team hopes to further refine the miniaturized instruments. They also need to build the full integrated systems with all the miniaturized electronics before they can seriously test the submersible's capability to survive in a frigid ocean—whether on Earth or on Europa.

"I don't think there are any particular technological breakthroughs required," Jonsson said. "There exist possible solutions for the technological barriers; however, further developments and optimizations are required for such a mission to succeed."

Getting down beneath the ice is still far from simple. Any Europa mission designed to penetrate the moon's icy surface would require a mole-like drill to melt its way through the ice. The submersible would also need kilometers of tether connecting it to a surface lander or station in order to communicate with its remote human operator.

Nobody is seriously planning a landing mission on Europa yet. But the European Space Agency aims to launch its JUpiter ICy moons Explorer mission (JUICE) to make the first thickness measurements of Europa's icy crust starting in 2030. NASA also has begun planning a Europa Clipper mission that would study the icy moon while doing flybys in a Jupiter orbit.

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3.5 / 5 (4) Jun 11, 2013
Any Europa mission designed to penetrate the moon's icy surface would require a mole-like dril

and it needs a lot of luuck not to hit any rocks along the way.

But even if no life exists down there such a mission would top my wish list of things that should be done sooner rather than later.
Water and burrowing tech are essential for space exploration. And who knows - it may be more senisble to burrow a scientific station beneath the ice of Europa (or right down into the ocean to float from place to place) than to put one on the surface of Mars.
1 / 5 (5) Jun 11, 2013
Tiny submersible could search for life in Europa's ocean

Yeah, it might be able to... but why?

Seriously - this isn't a flippant question. Missions like these cost bazillions, and truth to tell we don't even know if Europa's composition is what we are assuming it is. That NASA/JPL graphic of Europa's interior is from (or is also used in) http://teachspace...0304.pdf , and it is all based on speculation from distant observation.

Yes, it may ultimately turn out to be spot-on accurate, but for now we don't know that, and yet we teach "facts" about Europa, and develop plans on theories we can't pass off as facts because that would be just too much of an abasement of science, and yet people want to just throw whonkloads of cash to send a beercanbot to dig through what MAY be ice down to an ocean that we really can't claim we know is there.

In the meantime, since I can't stop the project, I'm looking forward to the hard data from the JUICE readings.
not rated yet Jun 12, 2013
life could possibly survive on icy Europa as well. But any life on Europa would only survive by hiding deep beneath Europa's crust because of the radiation from Jupiter

Maybe, but it is notable that life on Earth is specialized to take advantage of the spectrum of solar radiation that most strongly reaches the Earth's surface. If life were to form and evolve on Europa, is it possible that it would evolve to take advantage of the radiation from Jupiter, in some way similar to photosynthesis? Any kind of life under Europa's ice would need some chemical method of getting energy. It seems far simpler to adapt to the most abundant energy, no matter what form it takes.

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