How Much Closer To Fusion?

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Recently, it has been released that a group of scientists has edged significantly closer to the energetic break-even point of nuclear reactions.  Although we have long had the ability to create nuclear fission as an energy source, mankind has never been able to replicate the same processes of the sun, in the form of atomic fusion.  However, through a special process involving shooting a laser at a golden cylinder with a metal sphere filled with hydrogen isotopes inside, scientists at the National Ignition Facility have gained the highest yield of energy back yet.  Because it has never happened, the scientific community is searching for the “break even” point of nuclear fusion, wherein the energy they put in for the reaction to occur at least mirrors the energy given off.  As of right now, the only thing holding researchers back from this point is fine-tuning the instruments and methods used to create fusion.  The gold cylinder used gives off extremely powerful X-rays when hit with the laser, which in turn vaporizes the surface of the interior metal ball, causing the hydrogen isotopes to smash and fuse.  However, small imperfections in the surface of the metal ball cause fluctuations in pressure around the ball, causing implosions that waste energy.  By changing certain variables in the experiment, such as the length of time the gold cylinder is shot with the laser, researchers hope to increase the energy yield from the already impressive 80 percent to something greater.  Image

This is not the only form of the experimental nuclear fusion, however.  Another project, dubbed the International Thermonuclear Experimental Reactor, will examine how to use plasma suspended in magnetic fields as a form of self sustaining fusion.  Although this form of fusion has been done before, never before has it been used as energy for a power plant.  Although the scientist’s progress is slow, the progress they are making keeps them hopeful and optimistic

 

 

http://upload.wikimedia.org/wikipedia/commons/e/ed/Preamplifier_at_the_National_Ignition_Facility.jpg

http://www.stumbleupon.com/su/16l0xn/:J7hS77js:M$j7Q52x/www.livescience.com/40035-fusion-energy-gets-closer-to-reality.html/

https://www.google.com/search?q=nuclear+reaction&source=lnms&tbm=isch&sa=X&ei=bUZKUvWbFazyyAHe94HoBw&ved=0CAkQ_AUoAQ&biw=1124&bih=580&dpr=1#q=nuclear+fusion&tbm=isch&facrc=_&imgdii=_&imgrc=HoJwQmADbcliCM%3A%3Bbm_0V5qeQ3xC2M%3Bhttp%253A%252F%252Fupload.wikimedia.org%252Fwikipedia%252Fcommons%252Fd%252Fdf%252FSun_in_X-Ray.png%3Bhttp%253A%252F%252Fen.wikipedia.org%252Fwiki%252FFusion_power%3B690%3B500

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Farming on Mars?

NASA has been discussing a possible 2030s manned mission on Mars, since Mars is much further than the moon, food is more of a concern. Of course, the astronauts could always load enough food for the trip, but one particularly interesting suggestion was to GROW food on Mars. This suggestion raised a lot of questions. Can plants and crops survive on Mars? Would be we need a green house? The Sun is a lot weaker on Mars than the Earth, how would that affect the growth of the plants? The Mars doesn’t have an atmosphere like Earth does, would the atmospheric pressure affect the crops in a negative way?

 

Apparently, plants could in fact survive on Mars. It would take a big green house, since the thinner the atmosphere, the bigger the green house we need. The weaker Sun would slow down the growth of plants, but agricultural scientists have long been researching on artificial light to grow crops. Not only that, they have actually been able to focus the specific frequency of light wave that plants needs to increase the efficiency of their growth.

A quote that stood out in particular in the article follows, “Every great migration in history happened because we took our agriculture with us”. This quote speaks very well the most if not all the greatest explorations on Earth. Even in this very country, it all started with explorers coming to the New World, bringing along their crops and seeds as a means to survive. If we can sustain ourselves in a place, we can live and multiply there as well.

http://www.astrobio.net/exclusive/5483/farming-on-mars-nasa-ponders-food-for-mid-2030s-manned-mission

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Mars One: feasable or unreasonable?

In 2008, a Dutch entrepreneur named Bas Lansdorp sold the majority of his technology company and teamed up with Dutch physicist Arno Wielders to found the Mars One Foundation. Mars One, as it is known, is a non-profit organization with one goal in mind: to send humans on a one way mission to colonize Mars. If this does not sound crazy enough to begin with, Mars One does not even plan to send trained astronauts on this mission. As of August 31, the application for volunteers is officially closed, with 202,586 having applied from 140 countries. The only requirement to apply was being 18 or older. Eventually the applicant pool will be narrowed down to 40 people, who will then be trained in all the necessary for Mars survival, including technology maintainance, medical training, and skills in growing food on Mars. A public vote will then be held to determine which four applicants will be the first to make the seven month journey to Mars in the spacecraft Space X Falcon Heavy, an upgrade of Falcon 9. The Falcon heavy should be ready by 2014, although it will not leave for Mars until 2022.

This all may seem very possible at this point, but where the project falls far short is funding, of which they have none. The first one way trip is estimate to cost around $6 billion, with the other trips costing around $4 billion each. Mars One hopes to pay for this in part through money collected from applicants, who had to pay to apply. The rest of the money they intend to gather through a reality television show documenting the 40 applicants during the training process.

As of now, I have to say I do not see this project being successful. The technology is in place to accomplish this task, and interest in the project from the public is more than substantial, however, without a substance influx of cash, I just do not see this mission ever making off the landing pad. I believe this mission can only be successful with a gigantic grant from some government with amply money to throw into space exploration, which, in the current global economy, will be nearly impossible to come by.

 

Sources:

http://www.mars-one.com/en/

http://www.space.com/22758-mars-colony-volunteers-mars-one.html

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Water on Mars?

This post is in response to an article from Astrobiology Magazine.

NASA recently gave a press release finding that the materials on the surface of Mars are actually contain a small percentage of water. The soil was analyzed by the Curiosity rover which is located on Mars surface. Around 2% of the soil that is found on Mars surface is actually made up of water, and released carbon dioxide, oxygen and sulfur compounds when the sample began to be heated. According to prominent researchers, this will greatly contribute to the current understanding of the surface of mars and its processes.

The Curiosity Rover on Mars

So, what does this change? Will our perspective on Mars, and on the universe, forever be changed? Anyway you look at it, this is a great discovery. It shows that water is not only found on Earth, but could possibly be located on any planet. So, where did the water come from? Did the water come from comets, like what happened with Earth? Could life possible have existed, knowing that one of the most necessary ingredients is located, in part, on the surface?

What Mars could have looked like in the past

I’m curious to see what comes from this. The surface of a planet can tell a lot about it’s history. Maybe we can learn how to harness the water if humanity ever wanted to establish colonies there. With water remaining on the surface, perhaps technology could be created to take it to be usable for human life. Maybe this will further encourage space travel and exploration, knowing water could exist on the surface of other planets.

Image Sources:

http://www.astrobio.net/pressrelease/5712/curiosity-finds-martian-soil-contains-water

http://upload.wikimedia.org/wikipedia/commons/9/98/AncientMars.jpg

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Revised Essay

Terraforming in the Novel “Dune

 

            In Frank Herbert’s novel Dune, terraforming is a central plot point.  Though the book does bring up some of the moral dilemmas that face the issue it does not explain a terraforming process that would work as advertised in the book.  Paul’s (our protagonist’s) plan to terraform Dune involves nothing more than planting grasses and shrubs on the dunes of Arrakis.  In reality, terraforming a planet like Arrakis would take much more work than just replanting. 

            To understand the reasons for and against terraforming Arrakis, you need to understand the context.  Dune starts with some information and background on Paul’s father, Leto, then the ruler of House Atreides and how he came to posses the planet Arrakis, the setting for most of the book.  Leto was actually given Arrakis as part of a plot to kill him.  The Emperor hides his assault by using the Harkonnens to launch the actual attack; House Harkonnen and Astreides have been feuding for years.  Leto is killed, but Jessica, his lover, escapes with his son, Paul.  Jessica is one of the Bene Gesserit, a sisterhood of religious zealots who use genetic modification and breeding to create what they view as superior humans.  Living as one of the Fremen, the natives of Arrakis, Paul trains his mind and body.  Throughout the book, his actions are dictated by his lawful need to kill Harkonnen in order to avenge his father.  During his time with the Fremen Paul learns of their desire to turn their planet into a lush green paradise, the opposite of the waterless sandy desert it is.  Unfortunately, if the deserts leave then the sand worms will die out.  This is significant because the sand worms produce the drug melange, commonly known as “spice” which enhances the mental abilities of the user.  The Spacing Guild, which controls all space trade, requires spice in order to navigate space-time at faster than light speeds.  This makes spice so valuable that Arrakis, the only planet that produces spice, is the most valuable planet in the galaxy.  For this reason the emperor and the monopoly that controls all space trade are afraid of Paul terraforming the planet.  It is this leverage that Paul uses to eventually become emperor.

            The ethics of terraforming the planet Arrakis are another issue with the idea of turning the planet into a lush paradise.  The spice trade makes it complex, but when you think about the indigenous sand worms, plants and other animals the decision becomes even less clear.  If the Fremen and Paul terraform the planet they will be irreversibly changing its ecosystem and obliterating the native species.  Even beyond the natural environment, Fremen culture is centered on the desert and their desire for greener lands will be their culture’s undoing (Dune 424).  This is exacerbated by their view of water as analogous to life and as an irreplaceable object of value, “All of man’s water, ultimately, belongs to his people – to his tribe” (Dune 453).  The Fremen owe their entire culture and way of thought to the desert that they wish to destroy.

            Ethical reasons are not the only ones to stand in the way of the Fremen and Paul terraforming Arrakis. The logistics of creating a lush green paradise on a planet so barren that only the most conditioned, water-preserving beings in the galaxy can survive are almost laughably impossibly complex.  Replanting is possible to do on Earth, but even then it must be meticulously kept in order for the sand to not blow over the new foliage.  The book states that it will take at least “350 years before it [the planted forest] can be self sustaining” (Dune Appendix 1).  For fauna to be introduced it is concluded that they must cover at least three percent of the planet before photosynthesis will start producing enough oxygen for the larger insects to survive.  While it is true that adding forest will increase the amount of oxygen in the atmosphere, one must consider that the planet Arrakis has not had any meaningful photosynthesis in even the distant past.  Given this, it is unlikely that, given the relatively meager amount of oxygen each square kilometer of forest creates (Canada ENR) compared to the size of the atmosphere, there would be enough oxygen to support any insects at all even after hundreds of years with three percent of the planet forested.  All of the ideas that are proposed are good, but the logistics would be far too complex and the human resources required too much.  Another problem with the plan is that sand contains little to no nutrients, making it necessary to first grow grasses that can survive the lack of nutrients in order to create a layer of organic soil (Canada ENR).  While this is possible, it pushes the book’s estimation of 500 years total time back to a few thousand years at best.

            The terraforming of Arrakis is, while hypothetically possible, not very well explained, or thought out in the book.  Arrakis lacks water and organic soil, two things vital for forest and plants in general.  The human resources required are also fantastically huge.  These problems are overcome, but not in ways that would actually work on any scale but a geological one, and the plan would be completely foiled without an army of people planting and taking care of the forest.

 

 

 

 

Works Cited:

 

Canada Environment and Natural Resources. “Our Forests”  http://www.enr.gov.nt.ca/_live/pages/wpPages/Home.aspx

Herbert, Frank. Dune. 1965. New York: Berkeley, 1977.

 

 

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Scientific American Article: Earth’s Days are Numbered

Today I read an article in scientific American titled, “Earth’s Days are Numbered”.  The article started off with an estimate of the number of years the Earth will be able to support life as we know it; 1.75 billion.  While that number is longer than most can even comprehend, it is still less than might have been previously thought.  New models and forecasts for the sun put the Earth closer to the inside edge of the habitable zone than we previously thought.

The habitable zone is the area in which water can liquefy.  Too far away and the water will freeze, too close and it will be gas, both rendering it useless to any life we know of.  Though in a human lifetime the habitable zone seems static, over the life of a star the habitable zone can fluctuate dramatically.  As a star reaches the end of its life and starts to expand it will push the habitable zone outward as well.  The habitable zone’s current rate of movement is around one meter per year.

With this model researchers have been attempting to see planets that may be in the habitable zone of their star when we are moving out of ours.  While it is interesting to see new potential homes for Earth’s life, it has been suggested that the formula the researchers used for the model is too simple.  Without important information regarding the atmosphere and tectonic activity of the planets in question it is impossible to say if they could actually support life in the future.  Though the primary use of this model has been for extra solar planets it has also been used closer to home.  In around one billion years mars will be entering the habitable zone, if humans are still living, they may find refuge from the sun there.

Though the habitable zone may be redefined in the future, this still give us a rough idea of which planets could conceivably support Earth’s carbon based, water dependent life.  One thing that I could not help but think though is that this may be a bit too premature.  A billion and a half years is a really long time, longer than anything I can even imagine.  I find it hard to believe that there will even be humans in a billion years, and if there are they will probably not share much in common with us.  This may be pessimistic, but I think that by the time we are in need of a new planet, Humans will not be around to deliver life to it.

The article can be found here

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Gravity or Blasphemy? *spoilers*

Many of you may have seen the trailer for the upcoming space thriller Gravity. It’s due to hit theaters on October 4th, staring Sandra Bullock and George Clooney. If you haven’t seen the preview take a look.

While the movie certainly looks to be a heart-racing thriller with amazing visual effects, some people have already pointed out major flaws in the plot that tear down the movie’s credibility. The main dis-creditor is astronaut Dr. Michael J. Massimino, who has himself gone on similar missions to the one in the film. He went to see the movie with writer Dennis Overbye of the New York Times. (If you do not want to have details of the plot ruined, stop reading here.) An accident in space leaves Clooney and Bullock stranded out in space after doing repair work on the Hubble Telescope. Clooney decides their only chance of survival is to use the jetpack on his back to travel to the ISS. This is where the plot begins to detach from the realm of possibility. Overbye puts it brilliantly:

As we recall from bitter memory, the Hubble and the space station are in vastly different orbits. Getting from one to the other requires so much energy that not even space shuttles had enough fuel to do it. The telescope is 353 miles high, in an orbit that keeps it near the Equator; the space station is about 100 miles lower, in an orbit that takes it far north, over Russia.To have the movie astronauts Matt Kowalski (Mr. Clooney) and Ryan Stone (Ms. Bullock) zip over to the space station would be like having a pirate tossed overboard in the Caribbean swim to London.

If you didn’t want to read that whole quotation, basically what Overbye, along with input from Massimino, is stating is that it would be impossible for the Bullock and Clooney to travel the immense distance between the orbit of the Hubble to the orbit of the ISS.  Also according to Overbye, this would not be such a huge problem if the directors had not put as much work into realistically depicting physics and all the technology and gadgets in the film. One thing we all need to keep in mind is that this is a Holloywood movie we are talking about and not a documentary or educational video about space, so exaggerations are expected. I am still certainly excited to see Gravity when it comes out this Friday.

Sources:

http://www.nytimes.com/2013/10/01/science/space/an-astronaut-and-a-writer-at-the-movies.html?smid=tw-nytimes&_r=0

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Are we actually alone in the universe? Let’s take a look at the chemistry.

Everyone has at one point or another pondered the age old question: are the living beings that inhabit Earth the only organisms in the entire universe? Since everything that occurs in the universe is entirely up to the will of natural physics and is therefore extremely random, extraordinarily diverse types of planets exist everywhere; no two are the same. Some planets are too hot for life, some too small, some rotate too fast, some are not even solid structures, etc. Habitable planets, that is, planets that at least have the potential for life, are seemingly very rare throughout the universe. This detail is very important in the debate over whether or not extraterrestrial life exists, however the size of the universe is a slightly more essential fact to consider. Of an estimated 400 billion stars in our galaxy (also keep in mind that our galaxy is only one of hundreds of billions in the universe), how could only one contain an orbiting planet with life? No matter how difficult it is for life to arise from non-life (which is, of course, how life on Earth began), the scale of the universe is magnificent enough that it seems almost silly to say that we on Earth really and truly are unique.

This debate over the existence of aliens seems even more one-sided when you look at the chemical composition of Earth, which was obviously, in its infancy, one of the few planets actually capable of creating life. Since Earth was an eventual result of the big bang, as was everything else that exists in the universe, let’s take it back to the beginning to consider how we came to be.

At first, there was nothing, except for an infinitely dense spot that held all of the mass in the universe. Then, in an instant that we refer to as the big bang, this spot started to expand, forming the universe (which, of course, is still expanding).

The universe is infinitely expanding at an accelerated rate, so galaxies get further and further away from each other as time goes on.

The universe is infinitely expanding at an accelerated rate, so galaxies get further and further away from each other as time goes on.

The big bang got everything started by creating Hydrogen and Helium (and traces of Lithium). The Hydrogen and Helium went on to become parts of stars around the universe, which conducted nuclear fusion in their cores to create heavier elements. But, since stars have lifespans just as everything else does, they were ripped apart at the end of their lives by massive explosions starting in their cores known as supernovas. These supernovas scattered all of the elements created by the star’s nuclear fusion into the universe. Solar systems then formed from the enormous clouds of gas (with abundances of various elements within) that were left after the supernovas. Several billion years pass, and now people are studying the elements that were, in the very beginning, the reason for their existence.

Now that it is clear that everything in the universe had the same beginning, the following fact should be even more incredible – at our very core, we are made up of billions and billions of tiny carbon-based structures, without which we could not function effectively and live. This is such a shocking detail because even though life does not seem to be widespread throughout the universe, carbon, the element that allows us to exist, is just about everywhere. How could the main ingredient for life exist everywhere, while life itself is currently only known to exist in one place? It is this pondering that leads most scientists to believe that it is not that life does not exist somewhere out there in the cosmos, but instead that it is just extremely rare and difficult to find. The scale of the universe and adverse environment of deep space makes our search even more tough, and it is likely that the only thing holding us back from discovering a plethora of extraterrestrial species is current technology. Once we develop a way to travel through space much quicker and are able to sustain life on a spacecraft for extended periods of time, I can almost guarantee that we will find life.

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Life in the Clouds

(This post is in response to Discovery’s online article, “Does Alien Life Thrive in Venus’s Mysterious Clouds?” published 16 May 2013)

cloud city

It has always been thought that to live in the clouds, we would have to work our way up. Life needs a solid surface to develop and evolve… or does it? Could it be possible for life to evolve in an atmosphere of a world that only offers its hospitality amongst the clouds? A world where the surface temperature is too hot, at a constant 880 degrees Farenheit (1), yet just 30 to 40 miles above the surface the temperature and pressure almost mimics that of Earth’s (2). I am, of course, talking about Earth’s “twisted sister,” Venus.

untitled

The Discovery article lists a few reasons to consider life on Venus:

1. Venus demonstrates Earth-like temperature and pressure in a certain part of the atmosphere, about 30 to 40 miles above its surface.

2. There are currently bacteria in Earth’s clouds and in highly acidic conditions on Earth, as well, making acid-loving bacteria in the clouds of Venus seem plausible.

3. Venus’s mysterious absorption of UV light along with other unidentified particles could be a result of speculated acid-loving cloud bacteria.

There is one more consideration, unmentioned, but worth examining:

Perhaps it is possible to use a gas medium rather than a liquid medium for the formation of life. It may not have the highest probability, yet look at the Sun: a perfect example of how a miniscule probability can show itself if presented with enough opportunities (I am speaking of the miniscule probability that Hydrogen should fuse into Helium, of course.). Biochemistry with gas may have a low probability, but just look at the abundance of gases on Venus; look at the opportunity.

There may not be mystical cities among the clouds of Venus, such as the ones we see in Star Wars and other works of science fiction, but perhaps the planet can at least sustain microbial life. If only Carl Sagan were still around to speculate with us…

(1) Bennete’s Life in the Universe Textbook, chapter 7

(2) http://news.discovery.com/space/alien-life-exoplanets/are-venus-clouds-a-haven-for-life-130516.htm

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The Largest Aquifer On Earth

At the edge of a remote Mid-Atlantic ocean ridge, the Integrated Ocean Drilling Program (IODP) is using a  470-foot drill to take scientific samples of the ocean crust. Recent discoveries have shown that the deep ocean, once thought lifeless, is actually a hotbed for microbial ecosystems, collectively known as the “deep biosphere”. Using this drill, scientists are able to extract and analyze sediment cores to look at oxygen consumption and other factors that give insight into the survival of these microbial ecosystems. Findings using this drill have revealed that oxygen is “disappearing from seawater circulating through deep oceanic crust.” These findings seem to suggest that the microbes living within the oceanic crust, literally “buried alive”, are utilizing the oxygen in the deep ocean. Although this is just a first step, it provides concrete evidence for ideas that have been suspected for a long time. With this evidence, scientists can begin to quantify the metabolism of the deep biosphere, and to better understand how this ecosystem functions. This type of knowledge will, in turn, help us to better understand chemical cycling and the nature of life and existence on Earth. This could be big for the search for extraterrestrial life because it gives us a better understanding of biological and chemical processes here on Earth. The amount of life that is contained within the deep ocean crust is vast, and a better understanding of the inner workings of this ecosystem will only aid in the search for livable conditions outside of our planet, as well as life itself.

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