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Why are some stars brighter than others?

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Sarah Lowe

on 1 March 2013

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Transcript of Why are some stars brighter than others?

By: Sarah Lowe Why are some stars brighter than others? Short Answer: Further Explanation: Example: Example: Follow-Up Question: A stars luminosity and distance from Earth is what determines how bright a star seems to us. When you look up in the night sky you may notice that some stars are brighter than others. This is due to the fact that not all stars are equal distance from us on Earth. Nor are they the same luminosity.
Luminosity: the amount of energy a star outputs per unit of time.
Light intensity is also plays an important role in how much light we see from a star. Or how bright the star seems to us. ( This is directly related to distance.)
This basically shows that the farther away you become from the light source the less light you see, or the less intense the light becomes. (Decreases with distance) What determines a stars luminosity? Basically just shows the different stars, and how their distance is directly correlated with how much light we see emanated from them. The End You determine a stars luminosity by its temperature and size ( or specifically radius).
Scientist have created a equation to calculate a stars luminosity, by using temperature and radius. ([ luminosity=brightness x 12.57 x (distance) * Squared] Websites Used: http://science.howstuffworks.com/star3.htm http://dictionary.reference.com/browse/Luminosity?s=t http://www.space.com/14090-january-2012-skywatching-guide.html http://www.universetoday.com/31219/messier-6/ http://www.universetoday.com/82874/classification-of-stars/
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