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.”
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.”
Jim Steele | newswise
The dark side of the fluffiest galaxies
24.05.2016 | Instituto de Astrofísica de Canarias (IAC)
Astronomers confirm faintest early-universe galaxy ever seen
24.05.2016 | University of California - Los Angeles
In the Beyond EUV project, the Fraunhofer Institutes for Laser Technology ILT in Aachen and for Applied Optics and Precision Engineering IOF in Jena are developing key technologies for the manufacture of a new generation of microchips using EUV radiation at a wavelength of 6.7 nm. The resulting structures are barely thicker than single atoms, and they make it possible to produce extremely integrated circuits for such items as wearables or mind-controlled prosthetic limbs.
In 1965 Gordon Moore formulated the law that came to be named after him, which states that the complexity of integrated circuits doubles every one to two...
Characterization of high-quality material reveals important details relevant to next generation nanoelectronic devices
Quantum mechanics is the field of physics governing the behavior of things on atomic scales, where things work very differently from our everyday world.
When current comes in discrete packages: Viennese scientists unravel the quantum properties of the carbon material graphene
In 2010 the Nobel Prize in physics was awarded for the discovery of the exceptional material graphene, which consists of a single layer of carbon atoms...
The trend-forward world of display technology relies on innovative materials and novel approaches to steadily advance the visual experience, for example through higher pixel densities, better contrast, larger formats or user-friendler design. Fraunhofer ISC’s newly developed materials for optics and electronics now broaden the application potential of next generation displays. Learn about lower cost-effective wet-chemical printing procedures and the new materials at the Fraunhofer ISC booth # 1021 in North Hall D during the SID International Symposium on Information Display held from 22 to 27 May 2016 at San Francisco’s Moscone Center.
Staphylococcus aureus usually is a formidable bacterial pathogen. Sometimes, however, weakened forms are found in the blood of patients. Researchers of the University of Würzburg have now identified one mutation responsible for that phenomenon.
Staphylococcus aureus is a bacterium that is frequently found on the human skin and in the nose where it usually behaves inconspicuously. However, once inside...
24.05.2016 | Event News
20.05.2016 | Event News
19.05.2016 | Event News
24.05.2016 | Earth Sciences
24.05.2016 | Information Technology
24.05.2016 | Materials Sciences