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Although it looks like a plane, this vehicle is designed to launch a spacecraft at high altitude to minimize fuel consumption and damage to the environment
The dream of interstellar travel may not be as far off as it seems. With recent advancements in propulsion technology, and innovative thinkers and dreamers like Jeff Bezos, founder of Amazon.com and Blue Origin, Sir Richard Branson, founder of Virgin Group, which includes Virgin Galactic, and PayPal founder Elon Musk, who also founded Spacex, it’s now a concept just within our grasp. For example, Virgin Galactic’s goal is to get passengers in orbit possibly as early as next year, which is impressive!
However, there are a few challenges that may or may not make the difference on whether small commercialized spacecraft can make it into space, safely back down to earth, and keep relative time in check. Nevertheless, with the vast scale of technology available to us today, I believe it is possible to fix these problems in time for space travel to become vastly popular among Earth culture.
Orbital rehab program
The first of many of these problems, as many of you might already be aware of, is the unchecked and sometimes untrack-able space junk that flies around the earth. Recently, NASA has been working with radar technology to track as much of this debris as possible, but it is certainly not enough. The smallest bit of debris track-able by radar is currently the size of a softball, but that is just the tip of the iceberg. Softball sized objects are visible to radar only if the object is in a low orbit, the farther from Earth, the bigger the object needs to be. With the current limitations, only about 10% of the debris in space has been tracked and documented! Most of these objects are traveling around 5-8 miles per second, which at the size of a softball, is more than enough to blast a hole through smaller commercial spacecraft.
The technology for tracking junk around earths orbit needs to be improved before we can start actively removing some of it, but there also needs to be more aggressive measures for preventing additional debris from building up in our orbit. You might have heard about the two commercial satellites that crashed earlier this year, leaving a clutter of space debris to go swarming about earths orbit, but there have also been instances of astronauts losing tools objects from satellites and space stations into space. Working on measures to secure tools to an astronauts suit, and improving space collision detection should be our first priority when working on clearing up the orbit of earth.

What wonders Whipple’s do!
New technology has sprung about to dampen the blow to a spacecraft, but the effects thus far on commercial flight are dubious. The current shield being used today is called a Whipple shield, or Whipple bumper, and works on multiple layers of thin sheets of metal with gaps in between them so the first layer breaks the object up into smaller fragments, which the next layer can easily absorb. A stuffed Whipple has, between the layers of metal, a dampening object like Kevlar to increase it’s strength and let the shield absorb more blows.
Recently, NASA has started to install metal foam as a dampening agent, to be used as early as next year, to hopefully increase the shields effectiveness. The point of this new technology is to reduce the shield to weight ratio of a spacecraft, for the obvious reasons, while increasing the safety of the crew during all flight operations. It’s not an easy task, but the more research that goes into it, the better the result for passengers and astronauts alike.
A Whipple might be a great way to stop space debris from jeopardizing any potential passengers in a commercial spacecraft, but if they want to keep the vehicle small, new technologies, or smaller versions of the Whipple need to be developed. I highly doubt anyone is going to want to go into space on a craft that can barley hold three passengers and no lavatory! It would be much easier just to avoid the debris all together, but at the speed it is moving, and by the time you detect it and change course, it has already hit you and is possibly already five miles away. As well as the fact that, even though astronauts themselves seldom get hit with space debris, it is still very possible for one section of the craft’s shield to take too much damage, and possibly ripping the craft in two with a hull breach in a matter of seconds.
Even though space junk is a huge, and deadly, threat to commercial space travel, It will definitely increase the awareness of the problem if we had more and more people going on personal space vacations. The more we are able to do something, and the more of a danger there is to doing it, the more attention gets directed to solving the problem and making it safer. Current commercial air travel hasn’t always been as safe, and it is still being developed to make it safer and safer for passengers to fly.

Where to go, and will the Earth be the same when you come back?
This brings me to the next problem, destination. I guarantee you as soon as readily available space travel arrives, people will want to go elsewhere. A simple orbit around the earth is nice, and could be fun for a few hours, but spending days or weeks in a space craft will make anyone feel cramped.
The moon will definitely be the first place to go, which will only be a few hours away with VASIMR Technology (Variable Specific Impulse Magnetoplasma Rocket), but a destination like that will not be as interesting as a planet like Mars. Going to the moon for a vacation would be quite fun, since the gravity is lower and you get a very nice view of your home, but building a station there will probably take at least a decade. It’s another place you couldn’t stay at for too long, but I’m sure there will be some kind of camping arrangement for each shuttle craft so you could stay a few days. It makes sense to take a few supplies and when they run out, head back to earth.
The other destination, Mars will take about a month, give or take any conditions you meet out in space. This poses a huge problem, as taking a month trip to get to mars and then a month back to stay for only a day or two, even a week max, is absurd. If you were going to go there, there will have to be a colony or some sort of facility set up so that you could stay, and possibly even gain some income for all that time you missed at work, so don’t plan on going to mars anytime soon.
So, lets say we eliminate all of the other factors. Lets say we clear all the space debris, have a lunar and martian colony, and even shorten the trip there to about a week. Well, I would say we’re moving pretty fast, but it’s awesome to be able to travel our own solar system like this. The problem is, according to Einstein’s Theory of Special Relativity, time goes slower around you and/or your vehicle at higher speeds. Basically, time is normal for you, and anyone on earth, but if you were to look outside your window to your friend as you went by (assuming it was physically possible, which it isn’t) he would look as if he were trapped in fast forward, and you would look, to him, like someone trapped in slow motion! It’s almost like going into the future, but you never left the present. If we can propel ourselves to mars within a week, how fast will we be going? This might end up destroying our inner clock, or it might even seem like we’ve been gone for three or four months, rather than 30 days, ruining your plans for the weekend after your vacation.
The effects of time dilation on the human body are a bit hard to study, since we can hardly gather enough data on it. Going that fast for that long might just inject new problems to the situation. It is of definite interest for science to be looking towards time dilation, and a way to counteract that force. Even though it has been tested, we may end up wrong in the long run, which may be good. One less thing to worry about while going out into the universe, is a huge step for space travel.
Conclusion
With all of the problems that present themselves through commercial space flight, The challenge is definitely scaled enough that we can tackle it. The more we look into these problems, the better off we are as a society, and the better we can understand the universe and the forces at work behind it. I hope that within ten years, humans will be roaming about freely in our own solar system, and within about 50 to 100 years we’ll be an interstellar species, finding new information and materials to further our existence. To boldly go where no man has gone before!
Before I leave you, I did find an article pertaining to special relativity in Scientific American. It’s long, but it’s worth a read on quantum physics and time dilation. Read it here ->Was Einstein Wrong?: A Quantum Threat to Special Relativity
Torbjørn V.N.
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