Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Scientists’ Work May Lead to Mission to Find Out What’s Inside Asteroids

04.09.2014

Future asteroid mining operations and how we deal with an impending strike could be influenced by research on a potential NASA mission that’s being done by team that includes a University of Alabama in Huntsville (UAH) scientist.

“If you identify an asteroid coming toward us, how you deal with it could depend on its density and structure,” says Dr. Richard S. Miller, a UAH physics professor. “Likewise, if this technique pans out, you could imagine sending out a specialized telescope to determine what the densities and interior structure of various asteroids are, then decide on the basis of that information what ones to mine.”


Richard S. Miller / UAH

By detecting the number of muons that pass through the object at left, scientists can discover and measure the size of its core, shown reconstructed at right.

Little is now known about asteroid interior density and composition. Are they uniform or are they what astrophysicists call differentiated bodies, having denser and less-dense areas?

“Asteroids are time capsules of the early solar system,” Dr. Miller says. “We know about their surface properties and we can also infer the mass of some asteroids. But what we want to do is actually probe the interior of asteroids and determine information about their structure, are there interior density gradients, what is the composition – is it solid or like Swiss cheese – and do they have cores or not? Is it a pile of rubble? It turns out this structure can tell us a great deal about the conditions present during the early epochs of solar system formation and its evolution.”

To find that out, the team’s scientists will be borrowing imaging technology concepts developed for medicine and high-energy physics. They are developing a mission concept to probe asteroids using a technique similar to human computerized tomography (CT) scans. Dr. Miller is a co-investigator in a collaborative effort with the Planetary Science Institute (PSI), NASA’s Johnson Space Center, the Universities Space Research Association’s Arecibo Observatory (Arecibo/USRA) and the University of Houston to do the fundamental research and design that could lead to such a mission.

Led by principal investigator Dr. Tom Prettyman, senior scientist at PSI, the group has $500,000 in funding from the NASA Innovative Advanced Concepts (NIAC) Phase II program. The team’s two-year proposal, “Deep Mapping of Small Solar System Bodies with Galactic Cosmic Ray Secondary Particle Showers,” is one of only five projects selected for funding. Other funded collaborators include Dr. Steven Koontz, NASA Johnson Space Center; Dr. Michael Nolan, Arecibo/USRA; Dr. Lawrence Pinsky, University of Houston; and Dr. Mark Sykes, PSI.

The team proposes using ever-present cosmic rays to perform its measurements. All objects in space are constantly bombarded by these particles, which are thought to be the remnants of massive supernovas and are primarily protons. On Earth, the atmosphere breaks them up and shields us from direct hits.

“In space, on contact with dense matter like the moon’s surface or other airless planetary bodies, they interact within the first few centimeters of depth and create a shower of particles,” Dr. Miller says. Studying those interactions has provided us surface knowledge of asteroids. “But cosmic rays also contain muons, which are particles similar to electrons, but which can go a lot farther into the asteroid, in some cases up to one kilometer.”

The idea is to position a telescope to orbit the asteroid and measure the number and trajectories of the muons passing through it.

“Muons are like an SUV,” says Dr. Miller. “Once they are moving it is not easy to knock them off their course.”

An asteroid composed of varying densities of material would return a different pattern than one with a single density, just as a CT scan differentiates between densities of structures in the body. Likewise, if an asteroid has a denser core, it will stop muons from passing through and the telescope will detect the change. That process is called muon tomography and is well understood. Developed in the 1950s, it was even used in the 1960s by Luis Alvarez to map the Pyramid of Chephren.

“What’s different about a CT scan is that instead of using cosmic rays and muons to determine densities, a CT scan uses x-rays,” Dr. Miller says.

To mature the concept, the scientists must first solve a number of fundamental challenges. They’ll be using computer modeling to work on:

• Detailed estimates of the particle signatures, including muons and other radiations that will be present in deep space and in the neighborhood of any asteroids;
• Doing the initial work on the muon telescope’s design and operation. There are competing ideas, and the team will evaluate a variety of performance tradeoffs;
• The development and implementation of advanced algorithms for asteroid structure reconstruction;
• Establishing the preliminary outlines of how a proposed NASA mission would be conducted, its feasibility and making predictions of the ultimate science return.

“What it has to do is detect those muons and give us a direction they are coming from,” Dr. Miller says of the telescope, but getting to that goal involves tradeoffs.

For example, the bigger the area the telescope can scan as it orbits, the less time it will take to get results encompassing an entire asteroid being studied. But the greater the telescope’s size, the more resources will be involved to launch the mission. Also, to tell where the muons are coming from, the telescope will have to be able to tell directional “up” from “down.”

Dr. Miller says he was already exploring using muons to probe asteroids when he attended a conference and found that PSI’s Dr. Prettyman was working on the same thing.

“This is a good story of how you had two independent groups who were both looking at the same idea,” Dr. Miller says, “and we have joined forces to make a stronger project.”

Contact Information

Jim Steele
Research Writer/Editor
jim.steele@uah.edu
Phone: 256-824-2772

Jim Steele | newswise
Further information:
http://www.uah.edu

Further reports about: Arecibo CT Huntsville NASA PSI Space asteroids fundamental particles physics structure technique

More articles from Physics and Astronomy:

nachricht Computer model predicts how fracturing metallic glass releases energy at the atomic level
20.07.2018 | American Institute of Physics

nachricht What happens when we heat the atomic lattice of a magnet all of a sudden?
18.07.2018 | Forschungsverbund Berlin

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Future electronic components to be printed like newspapers

A new manufacturing technique uses a process similar to newspaper printing to form smoother and more flexible metals for making ultrafast electronic devices.

The low-cost process, developed by Purdue University researchers, combines tools already used in industry for manufacturing metals on a large scale, but uses...

Im Focus: First evidence on the source of extragalactic particles

For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.

To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...

Im Focus: Magnetic vortices: Two independent magnetic skyrmion phases discovered in a single material

For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.

Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...

Im Focus: Breaking the bond: To take part or not?

Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.

A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...

Im Focus: New 2D Spectroscopy Methods

Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.

"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Leading experts in Diabetes, Metabolism and Biomedical Engineering discuss Precision Medicine

13.07.2018 | Event News

Conference on Laser Polishing – LaP: Fine Tuning for Surfaces

12.07.2018 | Event News

11th European Wood-based Panel Symposium 2018: Meeting point for the wood-based materials industry

03.07.2018 | Event News

 
Latest News

A smart safe rechargeable zinc ion battery based on sol-gel transition electrolytes

20.07.2018 | Power and Electrical Engineering

Reversing cause and effect is no trouble for quantum computers

20.07.2018 | Information Technology

Princeton-UPenn research team finds physics treasure hidden in a wallpaper pattern

20.07.2018 | Materials Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>