Hey Bill Nye! How Will We Search for Life on Jupiter's Moon, Europa?

The mission to explore Europa, the moon of Jupiter with twice as much seawater as Earth, has entered "phase B," meaning the project now has funding from Congress.

Olwethu: Hi Bill. I'm Olwethu. I'm 16 years old from South Africa. My question is what are the future plans for the Europa trip and what instruments will be utilized to drill beneath the Earth's surface?

Bill Nye: So, the big news here in the United States is this mission to Europa, mission is what we call a spacecraft and all the people that work to support it. The mission to Europa is now in phase B. In other words, it's after phase A so it's been funded; there's money being spent selecting instruments for a spacecraft to go out to Europa, the moon of Jupiter with twice as much seawater as the Earth. And looking for signs of life is a tricky business because a spacecraft would be going very, very fast in order to get out there and get in orbit around Europa without just smashing into it.

So when you said the Earth's surface, I bet you meant the Europanian surface, the Europian surface. So along this line, I'm reluctant to call him our hero but there's a congressman in the U.S. Senate, in the U.S. Congress named John Culberson and he is a huge fan of sending a mission to Europa. He has a daughter who's 19, I believe, and he wants it so that she will know whether or not there is life on Europa, just like you. And so he has put in a congressional bill —this is here in the United States; this is the laws and regulations that provide money to NASA, the world's largest space agency — he has put money in there to make a lander for Europa. And in general the lander would be a thing with insect-looking legs and then some drill that gets really hot and melts through the ice. And the other plan they talk about all the time — they want to have a big, long tether, a big cable so this thing would melt through 20 kilometers of ice, like 15 miles of ice and look around in the Europanian ocean. It would be an extraordinary thing. Now this is a cool thing and we're very excited about it at the Planetary Society, but the drawback is humans being what they are and Congress being what it is here in the U.S., when something that ambitious or that expensive or that pricey is put in a bill, what often happens is the other side, the Senate, the U.S. government has two houses, just like lords and common and the other side will cancel that money set aside, but we'll see. Either way, there is a mission going to Europa and there is a proposal to make a very sophisticated, complicated lander to look for signs of life below the surface. The extraordinary, and I hope it happens while you're alive. I hope it does. Stay tuned.

 

The mission to explore Europa, the moon of Jupiter with twice as much seawater as Earth, has entered "phase B," meaning the project now has funding from Congress. Among the potential technological tools of the mission is a super-heated drill that would land on the moon's frozen surface and burrow through approximately 15 miles of frozen water, reaching the massive store of liquid water beneath. The mission is NASA's most ambitious attempt to find life in our solar system outside planet Earth.

Related Articles

Major study: Drug overdoses over a 38-year period reveal hidden trends

It's just the current cycle that involves opiates, but methamphetamine, cocaine, and others have caused the trajectory of overdoses to head the same direction

From the study: http://science.sciencemag.org/content/361/6408/eaau1184
Surprising Science
  • It appears that overdoses are increasing exponentially, no matter the drug itself
  • If the study bears out, it means that even reducing opiates will not slow the trajectory.
  • The causes of these trends remain obscure, but near the end of the write-up about the study, a hint might be apparent
Keep reading Show less

Why "nuclear pasta" is the strongest material in the universe

Through computationally intensive computer simulations, researchers have discovered that "nuclear pasta," found in the crusts of neutron stars, is the strongest material in the universe.

Accretion disk surrounding a neutron star. Credit: NASA
Surprising Science
  • The strongest material in the universe may be the whimsically named "nuclear pasta."
  • You can find this substance in the crust of neutron stars.
  • This amazing material is super-dense, and is 10 billion times harder to break than steel.

Superman is known as the "Man of Steel" for his strength and indestructibility. But the discovery of a new material that's 10 billion times harder to break than steel begs the question—is it time for a new superhero known as "Nuclear Pasta"? That's the name of the substance that a team of researchers thinks is the strongest known material in the universe.

Unlike humans, when stars reach a certain age, they do not just wither and die, but they explode, collapsing into a mass of neurons. The resulting space entity, known as a neutron star, is incredibly dense. So much so that previous research showed that the surface of a such a star would feature amazingly strong material. The new research, which involved the largest-ever computer simulations of a neutron star's crust, proposes that "nuclear pasta," the material just under the surface, is actually stronger.

The competition between forces from protons and neutrons inside a neutron star create super-dense shapes that look like long cylinders or flat planes, referred to as "spaghetti" and "lasagna," respectively. That's also where we get the overall name of nuclear pasta.

Caplan & Horowitz/arXiv

Diagrams illustrating the different types of so-called nuclear pasta.

The researchers' computer simulations needed 2 million hours of processor time before completion, which would be, according to a press release from McGill University, "the equivalent of 250 years on a laptop with a single good GPU." Fortunately, the researchers had access to a supercomputer, although it still took a couple of years. The scientists' simulations consisted of stretching and deforming the nuclear pasta to see how it behaved and what it would take to break it.

While they were able to discover just how strong nuclear pasta seems to be, no one is holding their breath that we'll be sending out missions to mine this substance any time soon. Instead, the discovery has other significant applications.

One of the study's co-authors, Matthew Caplan, a postdoctoral research fellow at McGill University, said the neutron stars would be "a hundred trillion times denser than anything on earth." Understanding what's inside them would be valuable for astronomers because now only the outer layer of such starts can be observed.

"A lot of interesting physics is going on here under extreme conditions and so understanding the physical properties of a neutron star is a way for scientists to test their theories and models," Caplan added. "With this result, many problems need to be revisited. How large a mountain can you build on a neutron star before the crust breaks and it collapses? What will it look like? And most importantly, how can astronomers observe it?"

Another possibility worth studying is that, due to its instability, nuclear pasta might generate gravitational waves. It may be possible to observe them at some point here on Earth by utilizing very sensitive equipment.

The team of scientists also included A. S. Schneider from California Institute of Technology and C. J. Horowitz from Indiana University.

Check out the study "The elasticity of nuclear pasta," published in Physical Review Letters.


How a huge, underwater wall could save melting Antarctic glaciers

Scientists think constructing a miles-long wall along an ice shelf in Antarctica could help protect the world's largest glacier from melting.

Image: NASA
Surprising Science
  • Rising ocean levels are a serious threat to coastal regions around the globe.
  • Scientists have proposed large-scale geoengineering projects that would prevent ice shelves from melting.
  • The most successful solution proposed would be a miles-long, incredibly tall underwater wall at the edge of the ice shelves.

The world's oceans will rise significantly over the next century if the massive ice shelves connected to Antarctica begin to fail as a result of global warming.

To prevent or hold off such a catastrophe, a team of scientists recently proposed a radical plan: build underwater walls that would either support the ice or protect it from warm waters.

In a paper published in The Cryosphere, Michael Wolovick and John Moore from Princeton and the Beijing Normal University, respectively, outlined several "targeted geoengineering" solutions that could help prevent the melting of western Antarctica's Florida-sized Thwaites Glacier, whose melting waters are projected to be the largest source of sea-level rise in the foreseeable future.

An "unthinkable" engineering project

"If [glacial geoengineering] works there then we would expect it to work on less challenging glaciers as well," the authors wrote in the study.

One approach involves using sand or gravel to build artificial mounds on the seafloor that would help support the glacier and hopefully allow it to regrow. In another strategy, an underwater wall would be built to prevent warm waters from eating away at the glacier's base.

The most effective design, according to the team's computer simulations, would be a miles-long and very tall wall, or "artificial sill," that serves as a "continuous barrier" across the length of the glacier, providing it both physical support and protection from warm waters. Although the study authors suggested this option is currently beyond any engineering feat humans have attempted, it was shown to be the most effective solution in preventing the glacier from collapsing.

Source: Wolovick et al.

An example of the proposed geoengineering project. By blocking off the warm water that would otherwise eat away at the glacier's base, further sea level rise might be preventable.

But other, more feasible options could also be effective. For example, building a smaller wall that blocks about 50% of warm water from reaching the glacier would have about a 70% chance of preventing a runaway collapse, while constructing a series of isolated, 1,000-foot-tall columns on the seafloor as supports had about a 30% chance of success.

Still, the authors note that the frigid waters of the Antarctica present unprecedently challenging conditions for such an ambitious geoengineering project. They were also sure to caution that their encouraging results shouldn't be seen as reasons to neglect other measures that would cut global emissions or otherwise combat climate change.

"There are dishonest elements of society that will try to use our research to argue against the necessity of emissions' reductions. Our research does not in any way support that interpretation," they wrote.

"The more carbon we emit, the less likely it becomes that the ice sheets will survive in the long term at anything close to their present volume."

A 2015 report from the National Academies of Sciences, Engineering, and Medicine illustrates the potentially devastating effects of ice-shelf melting in western Antarctica.

"As the oceans and atmosphere warm, melting of ice shelves in key areas around the edges of the Antarctic ice sheet could trigger a runaway collapse process known as Marine Ice Sheet Instability. If this were to occur, the collapse of the West Antarctic Ice Sheet (WAIS) could potentially contribute 2 to 4 meters (6.5 to 13 feet) of global sea level rise within just a few centuries."