Why are very few of the brightest stars that we see in the skies amongst the...

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Why are very few of the brightest stars that we see in the skies amongst the nearest stars? Show that a star of 10,000 times the luminosity of the sun is 1,000,000 times more observable than a star of solar luminosity. (The observ- ability of a star is related to the volume of space within which the star can be seen from Earth.) Why are very few of the brightest stars that we see in the skies amongst the nearest stars? Show that a star of 10,000 times the luminosity of the sun is 1,000,000 times more observable than a star of solar luminosity. (The observ- ability of a star is related to the volume of space within which the star can be seen from Earth.)