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Equilibrium

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Why? Files segment explaining the concept of equlibrium and how the Treehouse Detectives could maintain equlibrium in a Martian environment.

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Welcome, Mars Explorers. 00:00:00
I see you finished your terrarium. 00:00:02
Yes, I'm really pleased with it. I think the terrarium is very close to being in equilibrium. 00:00:04
What's in equilibrium? 00:00:08
It means that everything is in balance. 00:00:10
For example, in a balanced system, the amount of carbon dioxide consumed by the plants 00:00:12
is equal to the carbon dioxide produced by everything else. 00:00:16
My completed, sealed-off terrarium is a self-sufficient system. 00:00:19
That's great, Dr. D. We think we've found the solution to our Mars habitat problem. 00:00:23
We first had to learn a lot about the Mars environment. 00:00:27
Yes, we learned that it's a pretty harsh environment. 00:00:30
Cold, with a sparse atmosphere, and hardly any oxygen. 00:00:33
That meant that our habitat had to be entirely self-contained, except for sunlight. 00:00:36
That's a major source of energy. 00:00:40
Don't forget that gravity on Mars is only one-third as strong as that on Earth. 00:00:42
And we had to watch out for wind storms and meteors. 00:00:46
Since there's almost no oxygen on Mars, we decided we had better have lots of plants. 00:00:49
They not only provide us with food, but also oxygen. 00:00:54
That's right. We had to meet the basic needs of the astronauts. 00:00:57
Food, water, shelter, and oxygen. 00:01:00
And we checked into alien environments, and how plants can grow in them. 00:01:03
I learned that I need to acquire a taste for vegetables, since there won't be any meat. 00:01:07
One of our modules was a trash management facility. 00:01:11
There are a lot more than the four basic needs that need to be met in our habitat. 00:01:14
With our module, we also noticed that we had to take into account the adaptations 00:01:17
that astronauts will have to make to live on Mars. 00:01:21
That's great. Hayley, have you found any more information about your fish problem? 00:01:23
I talked to Mrs. Stewart's class, and they said that migratory patterns are usually consistent. 00:01:27
So I don't think the fish have migrated. 00:01:33
Probably correct. Otherwise, fish would be missing every year. 00:01:35
They suggested I talk to the Virginia Marine Science Committee. 00:01:38
And they said there had been an algal bloom in the bay back home. 00:01:41
But I'm not sure what that is. 00:01:44
Well, let's do an internet search. 00:01:46
Okay, let's pull up a search engine. 00:01:48
Type in the words algal and bloom. 00:01:51
Here's a site that says harmful algae page. 00:01:54
Okay, click on it and see what they have to say. 00:01:57
How does an algal bloom make all the fish disappear? 00:02:00
It says that algae use the nutrients to quickly multiply. 00:02:03
It also says that some algae are toxic to fish. That means that the fish die. 00:02:06
They can last up to a few days, and in some cases over a year. 00:02:11
I hope it doesn't last that long. 00:02:15
Me too. 00:02:17
Guys, we better get back to the treehouse if we want to see our presentation on KSNN. 00:02:18
I'm proud of you guys. I can't wait to see the presentation. 00:02:22
I've got a present for you. Here's a terrarium for your treehouse. 00:02:25
Try to give it lots of indirect sunlight. 00:02:28
Thanks, Dr. D. Bye. 00:02:30
Bye-bye. 00:02:32
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Idioma/s:
en
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:
359
Fecha:
28 de mayo de 2007 - 15:33
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
02′ 34″
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:
15.53 MBytes

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