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Question: How bright do stars shine? janette l gubala Answer: The amount of light a star emits depends on how much nuclear fuel is being consumed and on whether any of the emitted light can escape the surface of the star.
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www.newton.dep.anl.gov/askasci/ast99/ast99511.htm
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Astronomers use a special term to talk about the brightness of stars. The term is "magnitude". The magnitude scale was invented by the ancient Greeks around 150 B.C. The Greeks put the stars they could see into six groups.
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www.windows.ucar.edu/tour/link=/the_universe/Stars/magn...
www.windows.ucar.edu/tour/link=/the_universe/Stars/magnitude_scale.html
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The magnitude scale was invented by an ancient Greek astronomer named Hipparchus in about 150 B.C. He ranked the stars he could see in terms of their brightness, with 1 representing the brightest down to 6 representing the faintest.
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www.astro.wisc.edu/~dolan/constellations/extra/brightes...
www.astro.wisc.edu/~dolan/constellations/extra/brightest.html
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for convenience, we say that this amount of power equals one Sun. A star that has only half the power output of the Sun is said to have a luminosity of 1/2. Another measure of a stars brightness is called its magnitude.
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www.telescope.org/nuffield/pas/research/res3.html
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When you look at the night sky, you see several stars, some of which are bright and others faint. A star could be faint either because it is inherently less luminous, OR because it is really far away from us. ... So, to measure the brightness (the scientific term is luminosity) of the star, one needs to know its distance.
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curious.astro.cornell.edu/question.php?number=37
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Brightness of Stars ... Many stars are part of a double star system, and some will vary their brightness. Stars evolve through a life cycle that begins with their creation in an interstellar cloud. The cloud slowly collapses due to gravity, a protostar is formed and soon the internal temperature rises high enough to...
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www.space.gc.ca/asc/eng/educators/resources/astronomy/m...
www.space.gc.ca/asc/eng/educators/resources/astronomy/module2/content.asp
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Brightness of Light ... The words "intensity" and "brightness" mean the same thing in astronomy. ... Hipparchus (200 - 100 BC) classified the stars by their brightness...
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www.phys.ualberta.ca/~morsink/astro122/lect11/lecture11...
www.phys.ualberta.ca/~morsink/astro122/lect11/lecture11.html
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By combining Fourier optics with classical radiometry, a simple, compact formula is derived for computing the absolute irradiance of diffracted and aberrated images in optical systems. Within appropriate limits, the formula reduces to the ... A practical example concerning the image irradiance of stars is discussed.
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www.ingentaconnect.com/content/iop/ejp/2008/00000029/00...
www.ingentaconnect.com/content/iop/ejp/2008/00000029/00000005/art00023
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The Greek astronomer Hipparchos divided naked-eye stars into six brightness classes. ... Measuring the Brightness of Stars ... Photometry dates back more than 2,000 years to when the Greek astronomer Hipparchos divided the naked-eye stars into six brightness classes. The brightest visible stars he called stars of the...
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www.nmm.ac.uk/server/show/conWebDoc.334/viewPage/1
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