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NASA Sci Files segment exploring the different types of stars and how they are viewed through telescopes.
Hi, Bianca.
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Hi, DocTV.
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Welcome to Puerto Rico.
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Thanks for inviting me to come look through your telescope.
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Glad to have you.
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How does it work?
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This is the Reflecting Telescope.
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It has an eight-inch mirror that gathers a lot of light and makes dim objects visible.
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That's cool.
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So we can see the planets and stars.
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Yes.
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Did you know that at the Arecibo Radio Telescope in 1992, the very first planets outside of
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our own solar system were discovered?
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Since then, we've discovered over a hundred of what we call extra-terrestrial planets.
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You mean there are other planets not in our solar system?
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Why didn't we find them sooner?
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Planets are much smaller than stars, and because they don't produce their own light and they're
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light years away, they're very dim and difficult to detect.
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Do you think any of the planets have life?
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We don't know yet, but a lot depends on what kind of star they orbit.
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Stars all look the same to me, except some are brighter than others.
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Take a look.
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I've got the star Betelgeuse in the telescope.
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Betelgeuse.
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Isn't that a movie?
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Betelgeuse is a giant star.
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It's dying, and in its old age, it expanded to more than 500 times the size of the sun,
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which is larger than the orbit of Mars.
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I guess that if there were life on any planets around Betelgeuse, it wouldn't have survived.
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That's right.
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We don't expect to find life around giant stars.
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Do you know that stars come in different colors?
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Stars have colors?
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I guess Betelgeuse did look a little red.
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Here, check out this star called Regilon.
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It looks blue.
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Does the color mean anything?
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Yes, the color indicates temperature.
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Blue stars are hot, and red stars are cooler.
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That's different.
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Usually, blue is cold and red is hot.
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Isn't our sun yellow?
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Yes, our sun, a dwarf star, is not too hot, it's not too cold, it's just right.
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Very funny, Dr. D.
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In order to have life as we know it, a planet must be just the right distance from a star
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so liquid water can exist.
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It's called the habitable zone.
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If the star is too hot, there will be too much ultraviolet radiation.
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I know about that.
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It's what causes you to get sunburn.
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Luckily, I know about UV rays, and I'm wearing lots of sunscreen while I'm here in Puerto
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Rico.
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Yes, and hotter stars don't live very long, so there might not be time enough for conditions
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necessary for life to develop.
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So does that mean there will only be life on planets that have stars exactly like ours?
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They don't have to be exactly the same as ours, just similar.
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They can be a little hotter or a little colder.
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Here, take a look at this.
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It looks like a blue cloud.
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It's called the Orion Nebula.
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It's a glowing cloud of hydrogen gas 1,500 light years from Earth.
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Right now, stars are forming just behind this glowing cloud.
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If a star were born right now, we wouldn't know about it for 1,500 years.
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You've been paying attention.
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Let me show you something really spectacular.
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It just looks like a fuzzy patch of light.
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It's called the Whirlpool Galaxy.
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It doesn't look very bright because it is so far away.
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How far away is it?
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We don't have an exact distance, but we estimate it to be between 15 and 37 million light years.
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It has about 100 billion stars in it.
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That's amazing.
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With 100 billion stars, there's got to be a lot of just right stars, and at least one
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must have a planet with life on it.
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Well, if there isn't, there are hundreds of billions of other galaxies that might have life.
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Wow, trillions of galaxies with billions of stars.
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My mind hurts.
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Thanks, Dr. D.
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Anytime.
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See you later.
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Bye.
00:03:49
- Valoración:
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- Idioma/s:
- 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:
- 436
- Fecha:
- 28 de mayo de 2007 - 15:34
- Visibilidad:
- Público
- Enlace Relacionado:
- NASAs center for distance learning
- Duración:
- 03′ 51″
- 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:
- 23.15 MBytes
