Man's Place in the Universe; a Study of the Results of Scientific Research in Relation to the Unity Or Plurality of Worlds
Man's Place in the Universe; a Study of the Results of Scientific Research in Relation to the Unity Or Plurality of Worlds
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In our eReader you can find the full English version of the book. Read Man's Place in the Universe; a Study of the Results of Scientific Research in Relation to the Unity Or Plurality of Worlds Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Man's Place in the Universe; a Study of the Results of Scientific Research in Relation to the Unity Or Plurality of Worlds
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Then at some great distance we describe a sphere having its centre in our sun. Outside this sphere describe another one of a greater radius, and beyond this other spheres at equal distances apart indefinitely. Thus we shall have an endless succession of spherical shells, each of the same thickness.
The volume of each of these shells will be nearly proportional to the squares of the diameters of the spheres which bound it* Hence each of the regions will contain a number of stars in- creasing as ...the square of the radius of the region. Since the amount of light we receive from each star is as the inverse square of its distance, it follows that the sum total of the light received from each of these spherical shells will be equal. Thus as we add sphere after sphere we add equal amounts of light without limit. The result would be that if the system of stars extended out indefinitely the whole heavens would be filled with a blaze of light as bright as the sun." But the whole light given us by the stars is variously esti- mated at from one-fortieth to one-twentieth or, as an extreme limit, to one-tenth of moonlight, while the sun gives as much light as 800,000 fuU moons, so that starlight is only equivalent at a fair estimate to the six-millionth part of sunlight.
What to read after Man's Place in the Universe; a Study of the Results of Scientific Research in Relation to the Unity Or Plurality of Worlds?
You can find similar books in the "Read Also" column, or choose other free books by Wallace, Alfred Russel, 1823-1913 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Then at some great distance we describe a sphere having its centre in our sun. Outside this sphere describe another one of a greater radius, and beyond this other spheres at equal distances apart indefinitely. Thus we shall have an endless succession of spherical shells, each of the same thickness.
The volume of each of these shells will be nearly proportional to the squares of the diameters of the spheres which bound it* Hence each of the regions will contain a number of stars in- creasing as ...the square of the radius of the region. Since the amount of light we receive from each star is as the inverse square of its distance, it follows that the sum total of the light received from each of these spherical shells will be equal. Thus as we add sphere after sphere we add equal amounts of light without limit. The result would be that if the system of stars extended out indefinitely the whole heavens would be filled with a blaze of light as bright as the sun." But the whole light given us by the stars is variously esti- mated at from one-fortieth to one-twentieth or, as an extreme limit, to one-tenth of moonlight, while the sun gives as much light as 800,000 fuU moons, so that starlight is only equivalent at a fair estimate to the six-millionth part of sunlight.
What to read after Man's Place in the Universe; a Study of the Results of Scientific Research in Relation to the Unity Or Plurality of Worlds?
You can find similar books in the "Read Also" column, or choose other free books by Wallace, Alfred Russel, 1823-1913 to read onlineMoreLess
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