How a Space Mirror Could Deal With Orbital Debris and the Threat of an Asteroid Strike

Photo by Renden Yoder on Unsplash

On August 20, 2075, in Kalispell, Wyoming, a young amateur astronomer is drinking ice tea to cool his thoughts about the 103 degrees F. outside his window at 9:30 in the evening. Climate change is relentless. Harold thinks this is fairly normal weather. It’s been nearly this hot most of his adult life. 

Checking the laptop hooked to the homemade telescope in the plastic bubble on top of the house, he inputs values into a program and runs it. He runs it again. And again. He shows the results to several astronomer friends by email. They check it and verify the output. Soon thereafter, the world goes crazy. 

Something happened to asteroid 2005 YU55. It was supposed to come within 237,000 miles of Earth on November 8, 2075. Now it is on a collision course. Some other asteroid came close to or bumped 2005 YU55 and slightly changed its direction. NASA has known for weeks but not released the information for fear of mass panic. The amateur astronomers have forced the issue, and NASA holds a press conference. 

The head of NASA explains the situation is not as dire as it would have been just five years ago because of Project Drogon. Everybody knows about the large, focusing mirror in orbit because it has been efficiently vaporizing space debris cluttering orbital lanes near Earth for several years. Few gave thought to its second purpose until now. It’s shiny discs have been re-focused on 2005 YU55, and it is currently engraving an ablation trench in a spiral pattern as the asteroid sedately rotates every nineteen hours. The mirror is in an orbit that keeps it in sunlight 24 hours a day. 

Not meant to cut the asteroid in pieces, the focused power of the mirror explosively evaporates the surface material it comes in contact with. This creates, in effect, a thruster on one side of 2005 YU55, gradually changing its course. The Earth is saved, and the young astronomer is made the new head of NASA. Well … yes, the story does kind of break down there. That would not normally happen in real life, but the description of a focusing mirror is not so hard to believe. We have the technology. 

Imagine a mirror array with six circular pads in a circular array and one in the middle. Each pad is about 27 feet in diameter, made up of 120 flat panels per pad. Each panel is 2.25 feet square. Each panel is driven by a precision servomotor. With a total of 4,200 square feet, the mirror could concentrate 530,670 watts of power onto an area 2.25 feet by 2.25 feet. This is enough to vaporize most forms of matter. Note: Sun’s energy in space is 126.35 watts per square foot. 

Drawing by Glen Hendrix in AutoCad. Click to enlarge.

The entire mirror is aligned with its target using a system similar to that of the Hubble telescope. Six gyroscopes and four reaction wheels can target the mirror to within .007 arcseconds. Let’s use 2005 YU55 as an example to show what that means. Let’s say we start beaming concentrated sunlight to 2005 YU55 when it is a hundred million miles from Earth, 400 times further than the Moon, about 38 days away. This accuracy guarantees the beam will hit within 40 feet of where it’s pointed. Since 2005 YU55 is about 1300 feet in diameter, it is a pretty sure thing it will be hit. The space mirror’s software will automatically track the asteroid on its path through space. 

Drawing by Glen Hendrix in AutoCad. Click to enlarge.

To aim at objects beyond the orbit of Earth will require a reflector mirror about the size of the focusing mirror. It is much simpler, being a large, flat mirror that reflects the sun’s rays back to the focusing mirror when it’s pointed away from the Sun so that it can do its job. It will also need gyroscopes and reaction wheels as well as a suite of thrusters to position it. The whole thing could be lifted into orbit on a couple of Big Falcon Rocket trips with some assembly required, batteries included.  

Drawing by Glen Hendrix in AutoCad. Click to enlarge.

The space mirror may be particularly adept at getting rid of that modern day scourge—space debris. The modularity of this design would allow a killing field to be set up for approaching debris, an invisible tunnel of dense solar energy. The idea would be to completely vaporize debris, turning it into a spreading gas cloud without the inertia to be harmful. 

Astronauts working on reaction wheels of Hubble. Courtesy NASA.

Another application could be the smelting of ores in space. Nickel and iron from asteroids can be turned to steel. Ore from the Moon can be processed into aluminum. Off-world mining and other heat intense manufacturing processes will not be able to advance without this type of ancillary tool. 

Mirrors in space might come in very handy for diverting asteroids, mining asteroids, smelting metals, terraforming Mars, vaporizing space debris, and paving small areas of  the Moon with glass. Putting large mirrors in space, however, may have adverse political consequences for whatever nation or corporation that tries it. The main fear will come from those that don’t have a similar device in orbit worried that it could be used as a weapon. It would be possible to burn a hole in some other country’s spy satellite, start multiple fires in forests and brush lands, heat gas and oil lines until they rupture and burn, put a hole in a ship’s hull in the middle of the ocean, and on and on. Concerned parties would be looking at ways to guarantee the safe use of such tools, and they would have a legal basis for protest. One of the guiding principles of the Outer Space Treaty is “States shall not place nuclear weapons or other weapons of mass destruction in orbit or on celestial bodies or station them in outer space in any other manner; ....”   

Perhaps the United Nations will evolve to have its own space force, like Trump has proposed for the United States. Trained members of this elite task force will go into space along with worker astronauts to check out the control software of space-based mirrors, their focusing capabilities, their accuracy in aiming and maintaining that target, and all the other things that could turn such a dangerous machine into a weapon. Space Marshall U.N.! It will make a great TV series. Maybe the fiction has to come before the fact as it has with so many such ideas in the past. 

Other articles you may enjoy:

The Environmental Advantage of a Space Elevator

The U.S. Must Recycle Recycling

Climate Change Will Herald the Age of Island Cities

Carbon Capture and Sequestration (CCS): The Existential Technology We Are Ignoring

Nations at Risk of Becoming Psychological Echo Chambers: China Sets Worrisome Precedent

Climate Change Will Alter The Way We Think About Energy

What Do We Do Now That We Know Climate Change is Inevitable?

Are You Susceptible to Digitally Induced Cognitive Karma

Why the Oceans Will Be Humanity’s Life Raft

There May Be a Quadrillion Dollars Lying About on the Moon

Mining That First Asteroid - Manned Mission or AI?

A Convergence of Technologies Will Create a New Age of Space Exploration

Steampunk Meets Star Wars: A Harrowing Micro-Tale of Future Spacefarers

The Space Habitat Revisited and Revised

Are Seeds of Conflict Brewing Over the  Moon?

Just What Are NASA’s Plans Under Trump

Thruster On a Chip: An Alternative Rocket Science That Could Revolutionize Space Travel

Oumuamua: Alien Probe or Asteroid? It Could Be Both

Cryptocurrency Is Going Into Space

Going Back To the Moon Is Not Just for Governments Anymore

Why It Is a Certainty We Will Become a Space-Based Civilization

Asteroid Mining - How to Pick the Right Asteroid

Recycling Asteroids For Fun and Profit

Taking the 06-03-25 Asteroid Shuttle to Mars - An Alternative to Planned Mars Missions

A Heavy Metal, Cannibalistic Asteroid Propulsion System

Sticking the Landing On Your Billion Dollar Asteroid

Artificial Intelligence and Asteroid Mining Will Be a (Necessary) Match Made In the Heavens

The Weapon of Mass Destruction Nobody Is Talking About

How We Can Diminish the Possibility of Water Wars

There's An Asteroid Out There With All of Our Names On It

What Will Be the Most Common Currency In a Future Space-Based Society?

Workers In Space Will Live In Igloos

How We Will Get Asteroid Material Back To Earth

The Military Values High Ground - Space Is the Highest

Very Large Scale 3D Printing In Space

Energy and Space; Tweedle Dee and Tweedle Dum

China’s Strategy for the Future Is Scary Smart

The Environmental Advantage of a Space Elevator

image courtesy Obayashi Corporation 

Climate change is big. It’s bad. Don’t let anyone tell you otherwise. It’s going to be a rough few hundred, maybe few thousand, years for humanity. The short term view is not encouraging. The fossil fuel energy companies are going to fight tooth and claw to keep selling combustibles. The long term view is more optimistic. As the adverse affects of climate change begin to multiply and intensify, naysayers will be silenced, and social pressure will mandate change. Will it be enough soon enough? Hard to say. If mankind ever gets this CO2 problem under control, we will be looking at different ways to do business that protects the Earth in a more proactive manner, keeping the environment as ideal for life, all life, as possible. 

A space elevator may be the key technology for mankind to have it’s cake and eat it, too while the Earth’s climate rebalances. With a space elevator, all the nasty industrial processes that require a lot of energy and cause a lot of pollution could take place in orbit around the Earth. The end products of those orbital industries could then be more easily and cheaply transported to Earth via the space elevator. 

A space elevator could also preserve planetary resources. The materials needed for these myriad industrial processes may not even need to come from the surface of the planet. Most can be found in the asteroids or on the Moon. Need fuel? Load up an orbital tanker from a methane lake on Titan, one of the moons of Jupiter.  Need water. Find an asteroid made of water and mine it. It is estimated half the water in the oceans came from a bombardment of water-bearing asteroids.  Need metal? Nickel-iron asteroids are plentiful. Need energy? Build focusing mirrors for heat and solar panels for electricity. 

How does a space elevator work? Take a piece of string with a weight on one end. Pick the string up by the weightless end and spin around until the weight is straight out from your body. A ladybug makes an amazing landing on the string and starts walking out the string to the counterweight. You are the Earth, the string is the elevator cable or tether, the weight is the counterweight, and the ladybug is the car that goes up and down the cable. It’s not a perfect analogy, but it gives a good idea of what and where the major parts are. The counterweight would be about 60,000 to 90,000 miles up from the Earth’s surface. The center of mass of the whole thing should be at geosynchronous orbit, about 22,000 miles up. Now quit spinning and sit down because you’re gonna be dizzy. 

Currently, carbon nanotubes are in the running to be the material that can withstand the tremendous stresses of this application. Someone just has to figure out how to make a 60,000 mile long ribbon of the stuff with no imperfections. Meteoroids and space debris are a major problem. Protective measures must be implemented. A major clean-up of our space debris may be in order before we invest in such a mega-project as the space elevator. 

With the polluting industries moved to orbit, imagine the Earth as a giant natural park. Yes, we’ll live here, but not as obtrusively as before. One counterintuitive idea would be a further consolidation of humanity into supercities. Megalithic structures would house humanity. Supercities could eliminate untold millions of miles of transportation because everything and everyone is so close. Walking would be the preferred mode of transportation along with personal electric scooters and elevators. 

It would free up a lot of land for planting trees and other plants to sequester CO2. Meat would be grown or fabricated in a lab. Multistory greenhouses would grow our vegetables and grains. Supercities would be connected by high speed underground subways like Hyperloop. Other means of transportation will be electric drones and hybrid airships that can flip between heavier and lighter-than-air modes of flight. 

I know what you’re thinking. This is all such pie-in-the-sky fantasy stuff with no connection to reality. Fifty years ago, so was AI, GPS, autonomous vehicles, internet, and personal computers. The future looks bright. If we can just get there. Let us hope our immediate future holds in store political allies to humanity and the planet instead of what we have now. 



Other articles you may enjoy:

Carbon Capture and Sequestration (CCS): The Existential Technology We Are Ignoring

Nations at Risk of Becoming Psychological Echo Chambers: China Sets Worrisome Precedent

Climate Change Will Alter The Way We Think About Energy

What Do We Do Now That We Know Climate Change is Inevitable?

Are You Susceptible to Digitally Induced Cognitive Karma

Why the Oceans Will Be Humanity’s Life Raft

There May Be a Quadrillion Dollars Lying About on the Moon

Mining That First Asteroid - Manned Mission or AI?

A Convergence of Technologies Will Create a New Age of Space Exploration

Steampunk Meets Star Wars: A Harrowing Micro-Tale of Future Spacefarers

The Space Habitat Revisited and Revised

Are Seeds of Conflict Brewing Over the  Moon?

Just What Are NASA’s Plans Under Trump

Thruster On a Chip: An Alternative Rocket Science That Could Revolutionize Space Travel

Oumuamua: Alien Probe or Asteroid? It Could Be Both

Cryptocurrency Is Going Into Space

Going Back To the Moon Is Not Just for Governments Anymore

Why It Is a Certainty We Will Become a Space-Based Civilization

Asteroid Mining - How to Pick the Right Asteroid

Recycling Asteroids For Fun and Profit

Taking the 06-03-25 Asteroid Shuttle to Mars - An Alternative to Planned Mars Missions

A Heavy Metal, Cannibalistic Asteroid Propulsion System

Sticking the Landing On Your Billion Dollar Asteroid

Artificial Intelligence and Asteroid Mining Will Be a (Necessary) Match Made In the Heavens

The Weapon of Mass Destruction Nobody Is Talking About

How We Can Diminish the Possibility of Water Wars

There's An Asteroid Out There With All of Our Names On It

What Will Be the Most Common Currency In a Future Space-Based Society?

Workers In Space Will Live In Igloos

How We Will Get Asteroid Material Back To Earth

The Military Values High Ground - Space Is the Highest

Very Large Scale 3D Printing In Space

Energy and Space; Tweedle Dee and Tweedle Dum

China’s Strategy for the Future Is Scary Smart

The Military Values High Ground - Space Is the Highest

Moon being bombed by asteroids - courtesy NASA

The energy of the Sun near Earth is about 1368 watts/meter squared. The Falcon Heavy will be able to lift a directional mirror into space with a variable focus length of about 50 feet to thousands of miles. Its 332 square meters could focus 455,000 watts onto a spot the size of a baseball, vaporizing whatever has the poor fortune to be there at the time. 

Paper bags take 5 X the water to make and 7 X the fuel to transport than plastic bags 

Why would someone want such a machine? To mine asteroids. To mine the moon. To melt lunar regolith and asteroid material into shapes to build habitats in space or on the Moon. To power crucibles making steel and aluminum and other metals in space. To vaporize space debris that has become a hazard. Such power is handy in space, but there is a dark side. 

Asteroid being mined with solar mirror - courtesy Dan Brown on flickr

What if someone wanted to use such a mirror to do damage to a particular country or city for military purposes? One could set fire to or melt just about anything on the Earth or Moon with such a machine - cities, missile silos, air fields, ships, cities, individual buildings. No satellite in orbit would be safe. It could destroy the International Space Station. Keep the keys to the space mirror in a safe place.

There is a lot of money invested in the idea of moving an asteroid near to the Earth and mining it for metals and minerals. The acceptable location for such a huge mass of metal would be one of the lunar Lagrange points L4 or L5 where it would rest in a stable orbit about the Earth. Getting it there is the trick. It would require a robotic space tug. 

It costs $4000 to recycle ton of plastic bags worth $500 on open market. 

What if someone deliberately sabotaged the space tug’s guidance system and sent a kilometer diameter chunk of iron hurtling toward the Earth? The damage could be incalculable. From treasure trove for the future of mankind to the fall of civilization for some poor region of Earth, perhaps the whole planet. Or someone could attach such a tug to a smaller asteroid and program it to come fast out of the sun. Undetectable until it is too late. 

Asteroid being moved by space tug - courtesy Korite on flickr

These examples are besides what may be already in orbit or planned to go into orbit. This includes EMP (electromagnetic pulse) bombs and “rods of god”. Since 1967 it has been illegal to park atomic weapons in orbit, but that may not stop the likes of North Korea. To get around the orbital nuclear bomb ban, the U.S. has come up with a simple rod of tungsten dropped from orbit. The one foot diameter by twenty feet long cylinder of metal reaches ten times the speed of sound by the time it hits and mimics a small nuclear device in its devastation. It penetrates hundreds of feet into the ground, destroying underground bunkers and silos - something a nuclear weapon cannot do. 

That is not the only kinetic weapon available. Combine several NASA HiPEP ion thrusters with a TOPAZ style nuclear reactor, a guidance system, and a few tons of xenon (all properly armored against cosmic radiation); and you have a weapon that travels for light years and builds up a velocity that is an appreciable fraction of the speed of light. Besides targeting other planets for destruction, the truly paranoid might put such a device, perhaps several, in a long elliptical orbit around Earth, coming close to Earth on a periodic basis. In a form of mutually assured destruction, a country under attack could threaten to have one of these hit the Earth instead of continue its normal orbit. The affect would be similar to a super volcano eruption. Actual destruction might cover a continent. The weather effects could destroy the rest of civilization over the next few years.

It takes 7 trucks to move the same number of paper bags as one truck moving plastic bags. 

Another thing about having control of weapons in space is that it would allow an interdiction of anyone else coming into space for commercial or exploratory purposes. The entity in control of such weapons would be the arbiter of who comes and goes in space, who gets the benefits, who prospers and who doesn't. This is a very powerful position. This is the kind of lopsided power that starts wars.  

On June 18, 2018, President Trump directed the Pentagon to create a new division of the military - the Space Force. “My administration is reclaiming America’s heritage as the world’s greatest space-faring nation. The essence of the American character is to explore new horizons and to tame new frontiers. But our destiny, beyond the Earth, is not only a matter of national identity, but a matter of national security,” he announced. “[I]t is not enough to merely have an American presence in space. We must have American dominance in space.”

It seems the President may have been ill-informed about the advisability of a new branch of the military devoted only to space. The reason is that dominance of space means true dominance of the Earth. Other countries know this. The military has always valued high ground and space is the highest. That makes the President’s statement, “We must have American dominance in space,” one of the most nakedly aggressive of any leader of a nation on Earth regarding the frontiers of space. If any other large nations are taking him seriously, they will be making plans to counter aggressive actions taken in the last frontier.

With all of this death and destruction possible from outer space, it should be obvious that the exploration and exploitation of space should be done in joint ventures with as many countries participating as possible. This will cut down on paranoia about what any one country may be up to in space and prevent physical confrontations on Earth surrounding this subject and possibly prevent the use of space as the ultimate militarily strategic high ground. 

Other articles you may enjoy:

Oumuamua: Alien Probe or Asteroid? It Could Be Both

Cryptocurrency Is Going Into Space

Going Back To the Moon Is Not Just for Governments Anymore

Why It Is a Certainty We Will Become a Space-Based Civilization

Asteroid Mining - How to Pick the Right Asteroid

Recycling Asteroids For Fun and Profit

Taking the 06-03-25 Asteroid Shuttle to Mars - An Alternative to Planned Mars Missions

A Heavy Metal, Cannibalistic Asteroid Propulsion System

Sticking the Landing On Your Billion Dollar Asteroid

Artificial Intelligence and Asteroid Mining Will Be a (Necessary) Match Made In the Heavens

The Weapon of Mass Destruction Nobody Is Talking About

How We Can Diminish the Possibility of Water Wars

There's An Asteroid Out There With All of Our Names On It

What Will Be the Most Common Currency In a Future Space-Based Society?

Workers In Space Will Live In Igloos

How We Will Get Asteroid Material Back To Earth

Very Large Scale 3D Printing In Space

Energy and Space; Tweedle Dee and Tweedle Dum

China’s Strategy for the Future Is Scary Smart

We Will Live on the Moon: the How and Why

Solution to the Problem of Orbital Debris

image of space debris courtesy Wikilimages

An article in Universe Today points out that space debris is a huge problem. The retired head of NASA’s Orbital Debris Program Office, Donald Kessler, wrote a report on this describing the situation as bad and getting worse. Mr. Kessler originally predicted the scenario of orbital litter becoming a major problem for the advancement of the space program and a danger to satellites back in 1976. The situation he described has come to pass and is appropriately designated the Kessler Syndrome. 
A report from NASA makes two conclusions:

1. “The  current debris population in the LEO region has reached the point where the environment is unstable and collisions will become the most dominant debris generating mechanism in the future.”

2. “Only remediation of the near-Earth environment – the removal of existing large objects from orbit – can prevent future problems for research in and commercialization of space.”

Active Debris Removal (ADR) is recommended by NASA. A proposed solution to this problem is advanced in this article from Wired Science. It may have merit but it represents a lot of money to be spent just to see if it works. This is where the Space Mirror steps in to save the day.

My original Space Mirror concept (drawing shown) can be scaled up easily to perform the task of getting rid of orbital space debris. The Space Mirror consists of two disc-shaped membranes of sheet plastic approximately 8 mils thick. These are jam-up, jelly-tight next to each other. They are 1000 feet in diameter and keep their shape via an inner-tube-shaped, inflated toroid with a sectional diameter of 10 feet. The circular edges of these membranes are attached by airtight seal to the inside radius of the toroid. One of the membranes is transparent and and the other is mirrored on the inside surface. When gas is introduced between them they expand, deforming into spherical surfaces capable of focusing the sun’s rays on a small area. The focal length ranges from about a mile to almost 5,000 miles. A unit containing gas cylinders, computers, radar, and solar panels attached by a flexible umbilical provides the essentials for directing and focusing the mirror. The radar and other sensors work with the computer to fire small thrusters around the outer surface of the tubular frame keeping the device aimed and in the proper orbit. Small, semi-autonomous robots roam the cavities of the framing tube and the surfaces of the membranes looking for and repairing small punctures. It sounds like a big thing but it all folds up for one payload in the new spacecraft from SpaceX, the Falcon Heavy.

It takes 7 trucks to move the same number of paper bags as one truck moving plastic bags. 

This device was originally devised to facilitate the construction of space habitats, melting captured asteroids or meteors and then inflating them to create habitable spaces. Recently, other applications have come to mind. With its ability to direct and focus large amounts of energy, it makes a perfect mechanism to sweep from the littered skies of Earth the small debris that will eventually inhibit exploration of space and utilization of near-Earth orbits. It will simply focus the sun’s energy on these objects and they will vaporize. If you doubt this, look at the results of using just 22 square feet of concentrated sunlight. It will melt steel and even rock. Now imagine 800,000 square feet of sunlight (over 36,000 times that power) concentrated on a small area. Now double that energy because sunlight is twice as strong in space, unhindered by atmosphere. Material would not only melt, it would become a cloud of vapor almost instantly - exactly what you want orbital space debris to do. Another great thing about this concept is that it can be tested right here on the surface before installing it in orbit.

Debris strike simulation.

The 1500 pieces of large debris can also be taken care of by selectively zapping them, causing explosive reactions to decelerate them and bring them down to burn up in the Earth's atmosphere.
These represent 98% of space debris by mass and it is feared collisions between them will cause an increase in the threat of orbital debris to mankind's space aspirations.

The answer to the plastic bag problem is reuse. This new device makes it easy. 

Due to the implications for military applications, the Space Mirror would have to be an international effort, controlled by a committee made up by representatives of countries investing in the project. It could be set up for a specified period of time to do its job of cleaning debris from orbit and then be decommissioned. It is something that needs to be seriously considered if mankind is to advance into the frontier of space without tripping over its own trash.

Thanks,

Glen Hendrix

Look for my scifi novel Transmat World at Amazon.com