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Star brightness and star distance: Difference between revisions
From OER in Education
Star brightness and star distance (view source)
Revision as of 20:28, 26 September 2012
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|topic=Astronomy | |topic=Astronomy | ||
|subject=Science | |subject=Science | ||
|tagline=A slide presentation to explain how we measure the distance | |tagline=A slide presentation to explain how we measure the distance and brightness of stars. | ||
and brightness of stars. | |||
|image=Starsandbrightness0.png | |image=Starsandbrightness0.png | ||
|resourcenumber= SC0035 | |resourcenumber= SC0035 | ||
|Learning Objectives= | |Learning Objectives= | ||
* recall how star distances were calculated using parallax | * recall how star distances were calculated using parallax | ||
* explain how Christian Huygens calculated the distance of the star | * explain how Christian Huygens calculated the distance of the star Sirius | ||
Sirius | |||
* explain how Huygens' assumptions led to an inaccurate calculation | * explain how Huygens' assumptions led to an inaccurate calculation | ||
* how we use black body radiation to calculate the temperature of | * how we use black body radiation to calculate the temperature of distant stars | ||
distant stars | |||
|age=Secondary | |age=Secondary | ||
|content=In the 17th century, Christian Huygens discovered how to | |content=In the 17th century, Christian Huygens discovered how to estimate how far away a star is. He made a series of smaller holes in a screen facing the sun, until he estimated the light was the same intensity as the star Sirius. Huygens' results were surprisingly accurate, but still wrong. This lesson follows work where students learn how parallax can be used to calculate the distance of stars, though not all. Students often believe that the earlier scientists made foolish assumptions. This series of slides may inspire you to tell the remarkable story of how we measure stars. It may help you help students to | ||
estimate how far away a star is. He made a series of smaller holes in | understand the amazing stretches of imagination needed to come up with those early hypotheses. | ||
a screen facing the sun, until he estimated the light was the same | The teacher explains his slides in an audio file. He also provides a link to an black body radiation tool. | ||
intensity as the star Sirius. Huygens' results were surprisingly | |||
accurate, but still wrong. This lesson follows work where students | |||
learn how parallax can be used to calculate the distance of stars, | |||
though not all. Students often believe that the earlier scientists | |||
made foolish assumptions. This series of slides may inspire you to | |||
tell the remarkable story of how we measure stars. It may help you | |||
help students to | |||
understand the amazing stretches of imagination needed to come up with | |||
those early hypotheses. | |||
The teacher explains his slides in an audio file. He also provides a | |||
link to an black body radiation tool. | |||
|format= | |format= | ||
|strategy= | |strategy= | ||
| Line 39: | Line 25: | ||
|other= | |other= | ||
|resources= | |resources= | ||
* Teacher's audio explanation of how the lesson was delivered | * Teacher's audio explanation of how the lesson was delivered [[media:CT - Star brightness voiceover.MP3]] | ||
[[media:CT - Star brightness voiceover.MP3]] | |||
The presentation has been converted to alternative formats: | The presentation has been converted to alternative formats: | ||
* Smartboard notebook version | * Smartboard notebook version [[File:10 - Star Brightness, Size and Distance.notebook]] | ||
[[File:10 - Star Brightness, Size and Distance.notebook]] | * Powerpoint version:[[File:10 - Star Brightness, Size and Distance.pptx]] | ||
* Powerpoint | |||
version:[[File:10 - Star Brightness, Size and Distance.pptx]] | |||
* PDF version [File:Star brightness & distance.pdf]] | * PDF version [File:Star brightness & distance.pdf]] | ||
* Link to Blackbody Radiation Applet | * Link to Blackbody Radiation Applet http://www.mhhe.com/physsci/astronomy/applets/Blackbody/frame.html | ||
http://www.mhhe.com/physsci/astronomy/applets/Blackbody/frame.html | |||
}} | }} | ||
