tag:blogger.com,1999:blog-4297839691694588645.post6186728592591137448..comments2023-10-28T01:09:19.944-07:00Comments on Honors Biology: Space elevatorUnknownnoreply@blogger.comBlogger68125tag:blogger.com,1999:blog-4297839691694588645.post-45766621523536884202009-09-04T06:21:46.275-07:002009-09-04T06:21:46.275-07:00This comment has been removed by a blog administrator.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4297839691694588645.post-58559355173112352712009-09-03T03:31:47.407-07:002009-09-03T03:31:47.407-07:00This comment has been removed by a blog administrator.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4297839691694588645.post-23200908782473795032009-09-02T20:59:46.218-07:002009-09-02T20:59:46.218-07:00The Space Elevator would ascend and descend down a...The Space Elevator would ascend and descend down a 100,00 km long ribbon using laser beam power. Construction of this massive lift would take 10 years and cost 10 billion dollars to complete. Traveling from Earth to orbit in space would be $100/lb. There is a one week ascent time from Earth to the Moon. The lift would lift 1500 tons per year and the lift could be used for commercial access. Carbon Nanotubes are allotropes of carbon with a cylindrical nanostructure. They have extraordinary strength and unique electrical properties, and are efficient conductors of heat. <br />http://www.pa.msu.edu/cmp/csc/ntproperties/<br />http://wiki.spaceelevator.com/Annette_Vergarahttps://www.blogger.com/profile/13524512858127859881noreply@blogger.comtag:blogger.com,1999:blog-4297839691694588645.post-3166329346113698032009-09-02T20:27:22.014-07:002009-09-02T20:27:22.014-07:00Kevin Winslow
Period 4 Honors Biology
The crea...Kevin Winslow<br />Period 4 Honors Biology<br /><br /> The creation of the space elevator will greatly reduce the cost of getting from Earth to space. Building it will be expensive though. The elevator will be around 100,000 kilometers long and will cost about 10 billion dollars to build. We don't need the elevator at the moment but it would be nice to have it ASAP. The cost of the space elevator will be nowhere nearly as much if we continue launching rockets into space, which costs roughly 100 million dollars per launch. The elevator will also be much safer than rockets. If the project is started now, it will take ten years to finish and will be the tallest structure on the Earth.<br /><br />http://www.pbs.org/wgbh/nova/sciencenow/3401/02.html<br />http://www.thespacereview.com/article/916/1Kevin Winslowhttps://www.blogger.com/profile/15534106689451393624noreply@blogger.comtag:blogger.com,1999:blog-4297839691694588645.post-27577846471657813502009-09-02T20:03:16.757-07:002009-09-02T20:03:16.757-07:00Monserrat Sierra (:
Biology Honors
Period 7
Space...Monserrat Sierra (:<br />Biology Honors<br />Period 7<br /><br />Space Elevator<br /><br />Flown by Marshall Space Flight Center by NASA, space elevators are ribbons connected from the Earth to a counterweight in outer space. They are made from an advance carbon nanotube, which is 100 times stronger than steel and just as flexible as plastic! The cable is 62,000 miles long, 3 feet wide, and thinner than paper and can hold up to 20 tons. The climbers are traveled electrically. The cable can be built two ways. Long carbon nanotubes -- several meters long or longer -- would be braided into a structure resembling a rope or shorter nanotubes could be placed in a polymer matrix.(How Stuff Works)Many are now transferring from rockets to the space elevator because it will reduce cost and many payloads can be made easily and safely. Although NASA is planning to retire it by 2010 and put it back up at the earliest in 2014 due to funds.<br /><br />Sites Used<br /><br />http://www.spaceelevator.com/<br />http://www.pbs.org/wgbh/nova/sciencenow/3401/02.html <br />http://www.pbs.org/wgbh/nova/sciencenow/3401/02-why-flash.html<br />http://www.youtube.com/watch?v=F2UZDHHDhog<br />http://www.physorg.com/news151938445.htmlAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-4297839691694588645.post-44698189913615382772009-09-02T19:56:37.548-07:002009-09-02T19:56:37.548-07:00Daniela Menendez
Honors Biology
Period 7
The spa...Daniela Menendez <br />Honors Biology<br />Period 7<br /><br />The space elevator will be 22,000 miles long. Nasa will need about 144,000 miles of carbon nanotubes to make this elevator possible. Carbon nanotubes are made entirely out of carbon. They are stronger then steal and are able to conduct electricity. Some scientist don't know if it is feasible to use them, because of the fact that the longest carbon nanotube made was only a few centimiters long. And to make a 144,000 miles of carbon nanotubes by solely joining them end to end is completly impractical. However, there are still scientist that like this idea and are hopefull to construct carbon nanotubes by using vandervells force (which is like magnatism) to create long sheets of nanotubes that are the thikness of a 1,000th of a hair.<br /><br />http://www.youtube.com/watch?v=pnwZmWoymeI<br />http://www.physorg.com/news151938445.htmlDaniela Menendezhttps://www.blogger.com/profile/11899184677389629286noreply@blogger.comtag:blogger.com,1999:blog-4297839691694588645.post-7564892211813522342009-09-02T19:41:32.790-07:002009-09-02T19:41:32.790-07:00Alejandro Blanco
Period #2
When first designing ...Alejandro Blanco <br />Period #2<br /><br />When first designing a concept model for the space elevator, scientists ran into a problem, that was what to make this extraordinary project out of. Carbon nanotubes, "a material 100 times stronger than steel and as flexible as plastic", was chosen as one of the more feasible ideas for material usage. The next problem they ran into was how to build these nanotubes efficiently and effectively, unfortunately factors such as nanotubes being only a few centimeters long impede the continuation of this project. If these obstacles were to be overcome, the concept would then relate to that of a rope; scientists would braid together the nanotubes to form a long rope that could be anchored from space down to earth. All these factors change how difficult it will be to build an actual space elevator; one most think of factors such as reinforcement for nanotubes and pressure/temperature differences in the atmosphere. In all honesty, the plan for a space elevator may sound quite bizarre at first, but we were able to send astronauts to the moon in the 60's, with the technology we harness now we can accomplish anything. <br /><br />Bonsor, Kevin How Space Elevators Will Work. Retrieved September 2, <br /> 2009, Web site: http://www.howstuffworks.com/space-<br /> elevator.htmAlejandro Blanconoreply@blogger.comtag:blogger.com,1999:blog-4297839691694588645.post-75856728921323624792009-09-02T19:39:18.361-07:002009-09-02T19:39:18.361-07:00Michael Estevill-
Period 7/Honors Biology,
The co...Michael Estevill-<br />Period 7/Honors Biology,<br /><br />The cost for this super elevator could be both bennificial and non-bennificial to our world's economy. The cost simply for construction alone could range from 15 to say 20 billion dollars which is more than we can afford especially in such bad economic times. Now this does not necissarily mean that it will not pay for itself in a given period of time. Currently we are paying about 10,000 dollars per pound to send people into space. With this elevator built the cost will plummit all the way down to nearly 100-400 dollars a pound. There is one major problem with having a giant elevator sticking out of your atmosphere and that is the dangers of deep space. I mean anywhere from solar radiation to small meteor showers. If any serious damage was to be done to the exterior of this structure, than the price to fix it properly would be unimaginable. These are all important things that factor into the total cost of building a space elevator.<br /><br />http://www.howstuffworks.com/space-elevator.htmAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-4297839691694588645.post-12989240381521208642009-09-02T19:24:28.998-07:002009-09-02T19:24:28.998-07:00Maria Belen Martinez
Period: 4
For many the space...Maria Belen Martinez<br />Period: 4<br /><br />For many the space elevator was a science fiction idea up until recently.<br />NASA, along with other organizations,have been working on developing an elevator that will lead right up to the Space Station. Instead of the brutal launching, the space elevator will allow smooth ride 62,000 feet up. <br />This will be possible thanks to stronger than steel carbon nanotubes, which are developing very quickly. Twenty tons of these carbon nanotube cables would be needed to cover the 62,000 feet ride. Small fibers of nanotubes would be laid side by side and interconnected. <br />This space elevator would be useful for taking large amounts of materials or objects, even people, up to the Space Station.<br />This project won't be cheap, since they say that around 5 billion dollars would be needed. Some scientists say the space elevator could be developed within 20 years, others say it will take longer. Either way they both agree that the space elevator will be available to us in our lifetime. No matter how long it takes, the space elevator would facilitate travel into space at a lower price than its alternative the rocket.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4297839691694588645.post-42393315071951892362009-09-02T19:19:08.180-07:002009-09-02T19:19:08.180-07:00Evelyn Gonzalez
Period 4
The space elevator is ex...Evelyn Gonzalez <br />Period 4<br />The space elevator is expected to be a cable that stretches out into space. It is made up of carbon nanotube, the project of creating the space elevator is quite costly. At the price of $25/gram, the space elevator will cost around $20 million dollars. And that's just for the constuction of the space elevator. The cost for one elevator is $3000, for two elevators $1900, and for three elevators $1600. The space elevator will become one of NASA's greatest achievements.<br /><br />Sources<br />http://www.spaceelavator.com<br />http://www.wikipedia.org/wiki/Space_elevatorAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-4297839691694588645.post-41157703197099819822009-09-02T19:18:03.566-07:002009-09-02T19:18:03.566-07:00Augusto Ramirez
Period 7, Honors Biology
Space El...Augusto Ramirez<br />Period 7, Honors Biology<br /><br />Space Elevator<br /><br />A long viewed science fiction idea could possibly become true with many years of research. I’m talking about the space elevator which would be a revolutionary means of transport from earth into space. It includes a 22,000 mile long cable made out of special material called carbon nanotubes. Carbon nanotubes are extremely thin (Their diameter being about 10,000 times smaller than human hair), hollow cylinders made of carbon atoms but they are also 100 times stronger than steel and 1/5 as heavy. Making this space elevator could just be one of the most important inventions of our time, not only an advance in our knowledge and technology but also economy wise. Currently the cost for transporting objects into space in shuttles is $50,000/lb comparing to the near-future cost of $100/lb in a space elevator, it would also have more capacity (12,000 lb/day compared to the current 4,000 lb/day). Its lower cost would also influence to the usefulness of the space elevator, more private companies would invest to transport at a lower cost and more tourists will be able to pay for this type of transport. The thing is, its initial cost will be huge, about 6.2 billion dollars. That is, not including the operations cost or even additional cables needed. Although it might seem too expensive at first, the maintenance will be cheaper than now, and after this invention is finished I believe it will bring enough profit to pay it all off. Rather than wasting our money on the expensive rockets we should invest on this new and better way of traveling to space. <br /><br />Bibliography:<br />http://www.niac.usra.edu/files/library/meetings/annual/jun02/521Edwards.pdf<br /><br />http://www.space.com/businesstechnology/technology/space_elevator_020327-2.html<br /><br />http://researchweb.watson.ibm.com/nanoscience/nanotubes.htmlAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-4297839691694588645.post-54876142549625437632009-09-02T19:16:36.560-07:002009-09-02T19:16:36.560-07:00Alexandra Lara Period 4-
The space elevator is an ...Alexandra Lara Period 4-<br />The space elevator is an idea of a carbon nanotube composite ribbon that is meant to go up in space. The material that is going to be used to make this elevator is stronger than 100 times the strength of steel and is extremely flexible. It also can resist extreme temperatures like such in space. The elevator will make traveling to space much cheaper than space shuttles therefore many more people can travel to space. The price is said to be made at $220 to $880 per kilogram or $100 to $400 per pound of the cargo or person who is going up the elevator. In order to keep the ribbon taut, there will be a counterweight at the end of it. The length of the elevator will be 100,000 km or 62,000 miles, making it 180,720 taller than the tallest structure ever built by mankind, the CN Tower.<br />Sources:<br />-http://www.howstuffworks.com/space-elevator.htm<br />-http://www.spaceelevator.com/Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4297839691694588645.post-63847001220902103582009-09-02T19:10:39.560-07:002009-09-02T19:10:39.560-07:00I think that the space elevator is a great i dea b...I think that the space elevator is a great i dea but i do not believe that we will be able to build it any time soon. One thing is that NASA would need around 140,000 miles of nanotube. Another problem is that the cost to build the space elevator is incredibly high. The project is lacking government funding which is another problem. Even if they did make all the nanotubes their is still a chance that the space elevator could put to much pressure on them. I think that the space elevator is possible but we shouldnt be wasting our time or money on a project that is not really needed at the moment.<br /><br />www.spaceelevator.com<br /><br />www.physorg.comAlex Graddonnoreply@blogger.comtag:blogger.com,1999:blog-4297839691694588645.post-63484276250526083452009-09-02T18:56:42.353-07:002009-09-02T18:56:42.353-07:00Samantha Mora
Period 7
After researching the i...Samantha Mora<br />Period 7<br /><br /> After researching the impossible seeming space elevator, I actually believe that it can work. The space elevator is a “ribbon” of carbon nanotubes that extend from Earth all the way into space, approximately 62,000 miles long, three feet wide, and thinner than a sheet of paper, and is being planned on being built in 2010. Similar to a yo-yo spinning in the air, the ribbon is forced to be taut because of the centrifugal force it gets from the rotation of Earth. I think that nanotubes will work because they are extremely strong and flexible, and can allow vehicles up to 20 tons climb them into outer space. Not only is this concept possible, but I think it will also be convenient and, in the long run, cheaper than using ordinary space shuttles. Of course, it will be a number of years before the space elevator will become a successful reality, but it will be worth it once it is. <br /><br />http://www.youtube.com/watch?v=F2UZDHHDhog<br /><br />http://www.youtube.com/watch?v=pnwZmWoymeI<br /><br />http://www.howstuffworks.com/space-elevator.htmSamantha Morahttps://www.blogger.com/profile/06458548509647665016noreply@blogger.comtag:blogger.com,1999:blog-4297839691694588645.post-48093575220906129432009-09-02T18:50:24.559-07:002009-09-02T18:50:24.559-07:00Samantha Mora
Period 7
After researching the i...Samantha Mora<br />Period 7<br /><br /> After researching the impossible seeming space elevator, I actually believe that it can work. The space elevator is a “ribbon” of carbon nanotubes that extend from Earth all the way into space, approximately 62,000 miles long, three feet wide, and thinner than a sheet of paper, and is being planned on being built in 2010. Similar to a yo-yo spinning in the air, the ribbon is forced to be taut because of the centrifugal force it gets from the rotation of Earth. I think that nanotubes will work because they are extremely strong and flexible, and can allow vehicles up to 20 tons climb them into outer space. Not only is this concept possible, but I think it will also be convenient and, in the long run, cheaper than using ordinary space shuttles. Of course, it will be a number of years before the space elevator will become a successful reality, but it will be worth it once it is. <br /><br />http://www.youtube.com/watch?v=F2UZDHHDhog<br /><br />http://www.youtube.com/watch?v=pnwZmWoymeI<br /><br />http://www.howstuffworks.com/space-elevator.htmSamantha Morahttps://www.blogger.com/profile/06458548509647665016noreply@blogger.comtag:blogger.com,1999:blog-4297839691694588645.post-16665106739471324402009-09-02T18:48:08.931-07:002009-09-02T18:48:08.931-07:00The space elevator is a very old concept that scie...The space elevator is a very old concept that scientists and NASA is <br />trying to make a practical idea.it is basically a long tube that <br />brings you into space and would expand human civilizations into <br />space.the new ideas that have helped the concept to a realistic idea <br />are the new nanotube technology which is an alloy that is both light <br />weight and strong and flexible enough for the project.also the idea of <br />a counterweight to helpstabilize the elevator is revolutionary and is <br />making and bringing us closer and closer to making it a realistic <br />idea. Near the end of the 19th century a Russian scientist proposed <br />the idea of the space elevator by observing the eiffel tower and it <br />sounded like science fiction at the time.throughout the 20th century <br />different scientists mostly American and Russian because of their <br />concurrence for space exploration came up with the ideas and each new <br />version built upon another until the modern concept which we have <br />today was finally thought of and I believe tht it is nearly perfected <br />and will soon be a reality.<br /> <br />Source:<br />http://en.m.wikipedia.org/wiki/Space_elevator?wasRedirected=trueMaxGecklerhttps://www.blogger.com/profile/03908511858556204162noreply@blogger.comtag:blogger.com,1999:blog-4297839691694588645.post-17394439956061163052009-09-02T18:40:53.728-07:002009-09-02T18:40:53.728-07:00KKAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-4297839691694588645.post-55940761989243929532009-09-02T18:37:38.513-07:002009-09-02T18:37:38.513-07:00Benjamin Kaminsky Honors Biology P.4
A "Spac...Benjamin Kaminsky Honors Biology P.4<br /><br />A "Space Elevator" is a a long carbon nanotube that streches from the surface of the Earth to a object in outer space. In order for the elevator line to stay tawt, whatever object is used must be geosynchronized with Earth (a satellite will most likely be used). A laser from Earth will beam electricity to a solar panel on the elevator which will propel it up the 144,000 mile long nanotube.<br />The best benefit to building a space elevator is cost. Launching rockets and space shuttles are expensive ($10,000 for every pound that is launched) and they can explode in the atmosphere (Challenger, Columbia). Carbon Nanotubes however are virtually indestructible. A space elevator would provide a cheap, safe way for humans to travel to the stars. <br /><br /> <br />Sources:<br />http://www.physorg.com/news151938445.html<br />http://www.pbs.org/wgbh/nova/sciencenow/3401/02-why-flash.htmlAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-4297839691694588645.post-35359956893534075162009-09-02T18:32:50.793-07:002009-09-02T18:32:50.793-07:00Carla Casares
Biology Honors
Period: 7
The "...Carla Casares<br />Biology Honors<br />Period: 7<br /><br />The "LiftPort Space Elevator" commonly know as "The Space Elevator" is a ribbon of strong and light material called nanotubes. It will be anchored on Earth at the LiftPort Sation, connecting 100,000 km above where in space it will be attached to a counterweight. This is inexpensive and will open new economic opportunities. It will also reduce the cost of getting to space from Earth and is believed to be safer.It is estimated to cost about 20 million dollars, but in the long run it will be worthwhile. <br /><br />-www.liftport.com<br />-www.spaceelevator.com<br />-www.pbs.org/wgbh/nova/sciencenow/3401/02-why-flash.htmlAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-4297839691694588645.post-34809177094234133762009-09-02T18:14:02.498-07:002009-09-02T18:14:02.498-07:00Flavio Carvalho
Period 7
In 1895, Konstantin Tsio...Flavio Carvalho<br />Period 7<br /><br />In 1895, Konstantin Tsiolkovsky first came up with the idea of a space elevator. In 1979, Arthur C. Clarke thought of using carbon nanotubes, which are possibly 100 times stronger than steel and as flexible as plastic, for the space elevator, even though he was still surprised of some events that have taken place in that time. In 2000, David Smitherman and a group at a NASA workshop, determined that it is barely feasible to build the elevator with existing materials. But the concept is simple, which may change the space elevator from science fiction to an actual possibility. In 2005, NASA started a competition to see who can build a model space elevator, putting the idea as a very close possibility. Arthur C. Clarke believes that the space elevator in 2020, he is a very influential person in the science community and a very smart thinker about the future.<br /><br />Sources:<br /> http://news.bbc.co.uk/2/hi/technology/7304852.stm<br /><br />http://news.bbc.co.uk/2/hi/science/nature/4309586.stm<br /><br />http://www.accessmylibrary.com/coms2/summary_0286-28738711_ITM<br /><br />http://www.newscientist.com/article/dn10353<br /><br />http://www.indopedia.org/Timeline_of_the_future_in_forecasts.htmlflavioCarvalho2469https://www.blogger.com/profile/06323062450335755505noreply@blogger.comtag:blogger.com,1999:blog-4297839691694588645.post-14499282404274361992009-09-02T18:08:16.154-07:002009-09-02T18:08:16.154-07:00Keanu Tavares
Honors Biology Per. 2
The basic ide...Keanu Tavares<br />Honors Biology Per. 2<br /><br />The basic idea of the space elevator is to connect the earth with a counterweight in space, using tethers or ribbons most likely made of carbon nanotube fibers. The synthetic material would stretch 62,000 miles, or 100,000 kilometers. It is estimated that it will take $7 billion to $10 billion, and less than 50 years until we see it's completion. The space elevator, once complete, would be much more cost-effective, too. Current orbital launches typically cost $2,000 to $60,000 a pound. With the space elevator, launches would cost only $100 dollars or so per pound.<br /><br />http://cosmiclog.msnbc.msn.com/archive/2008/07/18/1206845.aspx<br /><br />http://www.spaceelevator.com/Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4297839691694588645.post-9773546508147513792009-09-02T18:07:40.242-07:002009-09-02T18:07:40.242-07:00Space elevator
A space elevator is a proposed s...Space elevator<br /><br /> <br />A space elevator is a proposed structure designed to transport material from earth surface into space. There are many variants proposed. The concept refers to a structure that reaches from the surface of the earth on or near the equator to geostationary orbit. For a space elevator, the cost varies according to the design. For the design they first have in mind has an n estimate cost of $10 to 20 billion dollars. The cost will go up with more renovations done to the elevator. So imagine how much it will cost when it’s done. (The elevator is 100,000 km long.)<br /><br />~Ashley Bain<br />per. 7<br />hbio.ashley bainhttps://www.blogger.com/profile/02551169313428533588noreply@blogger.comtag:blogger.com,1999:blog-4297839691694588645.post-44115191869661461602009-09-02T18:06:48.591-07:002009-09-02T18:06:48.591-07:00Period 7 honors bio
The space elevator will expan...Period 7 honors bio<br /><br />The space elevator will expand space exploration and will save money and fossil fuels which will immensely contribute to our environment . There is no exact cost of the space elevator, but there is an estimated cost of around $10 billion. A working elevator would reduce the cost of launching anything into space by roughly 98 percent. The elevator can carry hundreds of people at a time or 200 tons of cargo at $100 per pound. The space elevator will drastically effect the cost of space travel. More than 90 percent of a space shuttles weight is fuel, only 5 percent of the weight is cargo. On the elevator there is no fuel necessary because the elevator would be electric. It would be powered by a nanotube elevator ribbon, from a ground based laser beam. One of the only downsides to this project is the cost. It is my opinion that we should wait to invest in this project until our economy is stable.Hershel Cannonnoreply@blogger.comtag:blogger.com,1999:blog-4297839691694588645.post-5958931751789651972009-09-02T17:58:53.563-07:002009-09-02T17:58:53.563-07:00Jasmine Pattany
Period 7, Honors Biology.
Space E...Jasmine Pattany<br />Period 7, Honors Biology.<br /><br />Space Elevator<br />144,000 miles of nanotube is needed to build a space elevator. NASA is planning to construct the space elevator starting in 2010 and should be finished earliest by 2014. Nanotube is made of carbon. The space elevator is hoped to be used for space explorations and space colonization, and will make travel to space much cheaper. The nanotubes are basicaly a huge and light rope that will connect Earth to an object in orbit. The elevator would go up and down along the rope. Cambridge can make one gram of the carbon needed for the rope than can cover 18 miles. The estimated cost for this project is somewhere between 7 and 10 billion dollars. However, in the long run it would save money because it is a cheaper way to travel into space considering that rocketing (the alternative) costs much more.<br /><br />http://www.physorg.com/news15938445.htmlJasmine Pattanyhttp://jasminepattany.blogspot.com/noreply@blogger.comtag:blogger.com,1999:blog-4297839691694588645.post-2615118347753602592009-09-02T17:54:16.177-07:002009-09-02T17:54:16.177-07:00Conrad Ruiz
P.7
The space elevator is an idea to ...Conrad Ruiz<br />P.7<br /><br />The space elevator is an idea to create a 22,000 mile long cable comprised of a special material known as carbon nanotubes. The way they would do it is first, they would launch a satellite into geosynchronous orbit, 22,000miles above earth. then they would lowere the cable or ribbon down to earth, and attach it to a platform at sea. Clamped to the ribbon, elevator cars holding people or cargo would go up and down. Lasers on the ground would beam energy wirelessly to solar cells on the underside of the clamps, powering electric motors for the journey into space. The space elevator would be cheaper and safer than rockets.<br /><br />http://www.pbs.org/wbgh/nova/sciencenow/3401/02.html<br /><br />this was a great a video that i watched. I learned a lot and there is also the TV show Nova Science Now that is extremely cool.Anonymousnoreply@blogger.com