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Tethers - Contenido educativo

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Connect segment explaining how NASA uses tethers to help propell spacecraft already in orbit. The segment also explores the NASA project called ProSEDS which is the first to experiment with a tether system.

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Well that's pretty neat. I mean, NASA uses electromagnets and this track to help them 00:00:00
develop new ways to propel a spacecraft into orbit. And you know what? NASA's also using 00:00:05
electricity, magnetism, and tethers to help them propel spacecraft already in orbit. 00:00:11
Wait, you said tethers? Like tetherball with the pole and the rope attached to the ball? 00:00:16
Absolutely. Some other examples of tethers besides tetherball are the elastic string 00:00:21
that keeps a paddleball on a paddle, a fishing line that keeps the fish on a pole, and even 00:00:26
a leash that keeps a dog close to its owner. Maybe you can think of some more examples. 00:00:32
You know, NASA has been using tethers and conducting experiments in space for years. 00:00:37
You're right. In fact, in the 1960s, the Gemini astronauts used tethers to connect their spacecraft 00:00:44
to another unoccupied rocket. The 1960s! Far out, man. What? 00:00:56
Over the years, NASA has learned that connecting two spacecraft together opens up a whole new 00:01:07
world of possibilities, like propelling a spacecraft. One person who knows all about 00:01:12
tethers in space is physicist Les Johnson, and he works at NASA Marshall Space Flight 00:01:18
Center. Thanks, Van. We're testing a new kind of 00:01:23
propulsion system for space that doesn't need any rocket engines or fuel. Instead, it'll 00:01:26
use the Earth's magnetic field to help push or pull on the spacecraft. 00:01:30
All magnetic objects form invisible lines of force that extend between the poles of 00:01:34
the object. A magnetic field is the space around a magnet where you feel its force. 00:01:38
Magnetic field lines extend and radiate between the Earth's north and south poles, and between 00:01:44
the poles of a magnet. Basically, the Earth's magnetic field works 00:01:49
with a special type of wire or conductor called an electrodynamic tether to push or 00:01:53
pull on the object. The electrons that make up the electric current flowing through the 00:01:56
conductor will experience a force when they move through a magnetic field like the Earth's. 00:02:00
Since they're trapped in the conducting wire tether, the force will be applied to the tether 00:02:05
and whatever is attached to it. Depending upon the direction in which the current is 00:02:09
flowing, this force can be a push or a pull, either lowering or raising a spacecraft's 00:02:13
orbit. So the direction of the current determines 00:02:18
whether it's pushing or pulling. And the more current, the more force. 00:02:21
Right. In fact, NASA Marshall is working on a project called PROSEDS, which uses the Earth's 00:02:25
magnetic field to push or pull on the attached tether. When the tether moves, so does the 00:02:29
spacecraft. Les, PROSEDS is an acronym, right? What does 00:02:34
it stand for? PROSEDS stands for Propulsive Small Expendable 00:02:37
Deployer System. Space exploration is limited largely by the cost of launching payloads. 00:02:41
Finding a cheaper way to explore space is always very important to us. Typically, a 00:02:46
rocket will place its payload into low-Earth orbit, and from there, propellant-fueled thrusters 00:02:50
have to boost it to a higher altitude. PROSEDS is one experiment that focuses on the technology 00:02:55
to cut the expense of placing a payload into its final orbit. 00:03:00
Sounds like PROSEDS can be a nice alternative to using rocket engines and lots of fuel. 00:03:03
Absolutely. Electrodynamic tethers could one day be used as a cheap, lightweight, and reliable 00:03:08
way to remove space junk from orbit, keep the International Space Station in orbit, 00:03:13
and even power missions to other planets. Wow! This can get us to other planets? 00:03:18
Tethers offer unlimited possibilities, man. That's why I'm all charged up about this project. 00:03:23
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Idioma/s:
en
Materias:
Matemáticas
Niveles educativos:
▼ Mostrar / ocultar niveles
      • Nivel Intermedio
Autor/es:
NASA LaRC Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
464
Fecha:
28 de mayo de 2007 - 16:53
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
03′ 29″
Relación de aspecto:
4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
Resolución:
480x360 píxeles
Tamaño:
20.99 MBytes

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