NEW YORK Smithsonian astrophysicist Martin Elvis would like to see astronomers take on a crucial role for future asteroid mining: as astronomical prospectors scoping out the next big catch.
Elvis, a researcher with the Harvard-Smithsonian Center for Astrophysics in Massachusetts, discussed his dream for applied astronomy June 4 here at the Dawn of Private Space Science Symposium. Efficientasteroidmining would jump-start a space economy and bring down costs for exploration and space science, guiding humans into a modern space age, he said.
"My basic goal is just to revolutionize our exploration of the solar system, of the universe," Elvis said at the conference. [How Asteroid Mining Could Work (Infographic)]
Right now, he said, spaceflight and space science is unsustainably expensive. But asteroid mining could play a critical role in making those endeavors doable on a smaller budget, as private companies likeSpaceXhave decreased the launch cost per pound of payload.
But asteroid mining will face a critical problem, Elvis said: How to choose which asteroids will be worth the trip. And astronomers can play a crucial role in that determination, he said.
"The problem with asteroids is not many of them are valuable. You've got to find the right ones," he said. "We want to throw away that gray, stony stuff and deal with the carbonaceous or metallic ones, depending on whether you're looking for water or precious metals like platinum and palladium. So, this is where we [astronomers] come in."
As an example, Elvis pointed to the twin Magellan 6.5-meter telescopes in Chile. Professional astronomers could use telescopes of that size to characterize a faint asteroid in about 1-2 minutes. Eighty-five percent of asteroids could be thrown out based just on their color, he said, and the remaining 15 percent would be good prospects for sending small, exploratory probes using the data gathered about the objects' orbits and sizes.
Even a few nights per year would allow for the characterization of about 300 such objects, he said. And as larger telescopes come online, like the European Extremely Large Telescope and theGiant Magellan Telescope, the midsize telescopes could become more accessible for even more space-mining projects, he said.
"This means astronomers can turn out to be useful again [like] what [they] used to be, back in the days of navigation," he said. Similar to modern-day mining on Earth, there could be a multistep process of prospecting remotely "you don't just go straight to start digging rocks" before making a trip, Elvis added.
Such a process could cut asteroid prospecting costs by a factor of 10, he said. That would allow asteroid mining to flourish, lowering the cost commercially to put people and science in space.
On Earth, most of the precious metals, like platinum and palladium, are located 3,700 miles (6,000 kilometers) down, but they can come much nearer to the surface on asteroids. Those metals have dissolved in iron and were drawn to the center of the Earth, Elvis said, and the same thing happened on asteroids but the asteroids were then smashed up enough that it made the precious metals much more accessible. (Cometsalso contain valuable resources, especially water, Elvis said, but the energy needed to reach those fast-moving bodies makes them less worth the cost to explore.)
So far, Elvis has talked to the asteroid-mining companiesPlanetary ResourcesandDeep Space Industries, but neither company initially believed that this kind of remote prospecting would be necessary, he said.
"Both of them are dominated by engineers who are very good at building small spacecraft, and I'm sure they will succeed at building interplanetary cubesat-scale spacecraft for prospecting at the asteroid, but they were initially unbelieving of what I just told you," Elvis said.
They might come around, though, he added. "One of the companies did eventually realize that this was a necessary precursor to their sending out satellites," he said. "The other still isn't interested."
Original article onSpace.com.
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