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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 19:34, 26 September 2012
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* how we use black body radiation to calculate the temperature of distant stars | * how we use black body radiation to calculate the temperature of distant stars | ||
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|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 series of slides may inspire you to tell the remarkable story of how we measure stars. The teacher explains his | |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 | ||
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. | |||
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* Teacher's audio explanation of how the lesson was delivered [[media:CT - Star brightness voiceover.MP3]] | |||
The presentation has been converted to alternative formats: | |||
* Smartboard notebook version [[File:10 - Star Brightness, Size and Distance.notebook]] | * Smartboard notebook version [[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 http://www.mhhe.com/physsci/astronomy/applets/Blackbody/frame.html | * Link to Blackbody Radiation Applet http://www.mhhe.com/physsci/astronomy/applets/Blackbody/frame.html | ||
}} | }} | ||
