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Propulsion Systems

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Sci Files segment explaining propulsion systems, how they work, and what they do.

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Hi, I understand you'd like to know more about propulsion systems. 00:00:00
Yes, we're trying to design an out-of-this-world vacation, 00:00:04
and realize because of the great distances in space, 00:00:07
we might need to get there a different way. 00:00:10
But how do we currently travel to space? 00:00:12
We use chemical rockets that produce a jet of exhaust gases, 00:00:14
and these gases propel the ship forward. 00:00:19
How long would it take a spaceship to reach Mars? 00:00:22
About ten months. 00:00:24
Ten months is not that long. 00:00:26
So why aren't chemical rockets good enough? 00:00:28
To an astronaut, ten months in space is a long time. 00:00:30
Persistent radiation of space will weaken your immune system 00:00:34
and also damage your bones, 00:00:39
so you would like to go there as fast as you can. 00:00:41
Yes, we learned a little about physiological losses 00:00:45
from Beth Shepard in our last case. 00:00:47
What will the propulsion systems in the future be like? 00:00:49
Instead of using the heat from a chemical reaction, 00:00:52
future rockets will use something called a plasma. 00:00:56
What's plasma? 00:00:59
Plasma is a gas which has been superheated to millions of degrees. 00:01:01
It is even hotter than the interior of our sun. 00:01:05
That's hot. 00:01:09
How will the rocket not burn up with such a high temperature? 00:01:10
Since there is no known material that can take those temperatures, 00:01:13
we will not use materials. 00:01:17
We are going to use an invisible force field 00:01:19
that will hold this plasma and prevent it from touching any surrounding material. 00:01:22
How will it work? 00:01:27
The magnetic field is like an invisible tube 00:01:28
that will contain and guide the plasma to provide a much hotter exhaust. 00:01:32
Where will you get the energy to heat the plasma? 00:01:37
We will get the energy from electricity 00:01:39
generated by an onboard nuclear power plant. 00:01:42
Will plasma rockets be used to travel outside of our solar system? 00:01:46
Actually, plasma rockets will become even more powerful 00:01:50
where the energy of the plasma will be generated by an internal source, 00:01:53
a thermonuclear reaction called fusion. 00:01:59
I've heard of fusion. It sounds fast. 00:02:02
Fusion rockets will be so fast 00:02:05
that it will be possible for people to travel to the farthest reaches of the solar system 00:02:08
and be able to return to their families within a couple of years. 00:02:13
How long before we have this type of space travel? 00:02:16
It's hard to tell. One never knows about progress. 00:02:19
It could be as long as 50 years, 00:02:22
but then again, it could be less. 00:02:25
Why so long? 00:02:27
Developing new technology takes time, 00:02:29
and we do want to make sure it's safe. 00:02:32
I know NASA is very cautious and always puts safety first. 00:02:34
Thanks, Dr. Chang-Diaz, for giving us a lot to look forward to in the future. 00:02:37
You're welcome. 00:02:41
And don't forget to have fun designing your vacation. 00:02:42
And be sure to call if you need anything else. 00:02:46
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Idioma/s:
en
Niveles educativos:
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Autor/es:
NASA LaRC Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
482
Fecha:
28 de mayo de 2007 - 15:34
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
02′ 49″
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:
17.00 MBytes

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