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Meteors

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Subido el 28 de mayo de 2007 por EducaMadrid

219 visualizaciones

NASA Sci Files segment explaining what meteors, meteoroids, and meteorites are and the differences in these.

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Hi, Mr. Balki. It's neat that you actually have a meteorite named after you. 00:00:00
Yeah, we're a little confused on what a meteor actually is. 00:00:06
Isn't it the same thing as a meteoroid and a meteorite? 00:00:10
I'm glad to help you. Actually, I had an asteroid named after me. 00:00:13
It's easy to get them confused. 00:00:17
Meteoroids are small pieces of rock from an asteroid or comet drifting in outer space. 00:00:19
When a meteorite enters into the Earth's atmosphere and burns up, it's called a meteor. 00:00:25
People often see these meteors and call them shooting stars. 00:00:30
People near us have reported seeing a fireball. Is a fireball like a shooting star? 00:00:33
Yes, a fireball is a name given to a particularly bright meteor. 00:00:38
They are sometimes so bright they can be seen in the daytime. 00:00:42
What's a meteorite? 00:00:45
Most meteorites burn up completely when they enter into Earth's atmosphere. 00:00:48
But if it's large enough and survives and impacts the Earth, it's called a meteorite, such as the one I'm holding here. 00:00:52
Some meteorites can cause craters, such as the one in Meteor Crater in Arizona. 00:00:58
We understand that a fireball was sighted near our town and that it may have caused a sonic boom. Is this possible? 00:01:02
Yes, if it's large enough. The larger size will allow it to last longer and penetrate deeper into the atmosphere. 00:01:08
The sonic boom is caused because the meteor is traveling faster than the speed of sound. 00:01:15
Can a sonic boom from a meteor be powerful enough to cause a seismic reading? 00:01:20
Yes, a seismometer will detect a sonic boom from a large meteor. 00:01:24
However, to hear the sonic boom, you have to be relatively close, typically within 50 miles or so. 00:01:28
And the fireball is visible as far away as 500 miles away. 00:01:34
I would love to see one. 00:01:38
Most fireballs are not observed because 75% of the Earth is ocean and there aren't too many people in the middle of the ocean. 00:01:40
In July of 2001, there was a fireball that was seen from Virginia to Ontario, Canada. 00:01:46
And sonic booms were reported by people stretched over an area of more than 100 miles. 00:01:51
This has been a lot of help, Mr. Balki. I think we found the answer to our mystery. 00:01:56
Dr. Peter Brown at the University of Western Ontario is an expert on fireballs. 00:02:00
You might want to send him an email and ask him some more questions. 00:02:05
Thanks so much. 00:02:08
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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:
219
Fecha:
28 de mayo de 2007 - 15:33
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
02′ 10″
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:
13.16 MBytes

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