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Transit of Venus - Contenido educativo

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Connect segment that explains the Venus Transit and compares it to a solar eclipse.

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Thanks, Jen. 00:00:00
A Venus transit occurs when Venus crosses the disk of the Sun as seen by an observer. 00:00:04
It's like a solar eclipse in that Venus is located on the line between the Sun and the 00:00:09
Earth and therefore blocks some of the Sun's light. 00:00:13
However, in a Venus transit, the amount of sunlight blocked is very small compared to 00:00:17
a solar eclipse, and so the observer who is unaware will never notice it. 00:00:21
Venus's circular shadow is much, much smaller than our Moon's shadow. 00:00:26
Even though Venus is nearly the size of the Earth, it is much farther away than the Moon. 00:00:30
In clear weather, Venus transits are visible with the naked eye or with a small telescope, 00:00:34
which is why they became popular in the 1600s. 00:00:39
Before the advent of radar, Venus transits were used mainly for the measurement of the 00:00:43
astronomical unit, or the Sun-Earth distance, as you've heard earlier. 00:00:48
The biggest activity surrounding the June 2004 Venus transit will be the International 00:00:52
Network of Amateur Astronomers. 00:00:57
These astronomers will measure the astronomical unit with the Venus transit using the same 00:01:00
techniques as used by the early observers. 00:01:04
An innovative aspect this time, however not available in 1882, is the widespread use of 00:01:07
the Internet to organize international participation and the ease of access to the tools needed 00:01:12
to make the parallax calculations. 00:01:17
There also will be a few astronomical researchers who will try to exploit state-of-the-art observing 00:01:19
tools to see what can be learned about the use of transits to investigate planets around 00:01:24
other stars. 00:01:29
Transits are currently being used to search for such planets. 00:01:31
Perhaps this Venus transit will lead to some new technique or measurement that will allow 00:01:34
future researchers to further study the terrestrial planets during long-range planet-finding missions. 00:01:38
The Venus transit will also serve to remind us of Earth's place in the cosmos. 00:01:44
The tiny dot crossing the solar disk is a terrestrial planet with an atmosphere, and 00:01:49
yet it is far from an Earth. 00:01:53
Venus was once called a twin Earth, in part because of its similar size and distance from 00:01:55
the Sun. 00:01:59
It is now known to be a place that is extremely hostile to life for reasons that are still 00:02:00
under study. 00:02:05
One can speculate how our own pale blue dot would look to some distant alien astronomer 00:02:06
as it passed across the Sun in transit, and whether it has ever been so observed. 00:02:10
Maybe one day humans will be able to observe the Earth transit. 00:02:15
To learn more about the planet Venus and the Venus transit, check out the Sun-Earth Connection 00:02:18
Education Forum website. 00:02:23
Take it away, Jennifer! 00:02:25
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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:
391
Fecha:
28 de mayo de 2007 - 16:52
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
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:
14.89 MBytes

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