The Number of StarsEleven hundred years ago, the number of stars you could see would have been about 2400 at any one time. So through most of history, the real number of stars known were just the brightest ones.With the invention of the first telescope the number of stars increased to just about 28160. But, even that was just the beginning toward knowing reality.Even with one of the latest telescopes on earth (like one at the Australia Telescope Compact Array made in 1988 at Narrabri, Australia), you can't see them all. The distortion of the atmosphere limits what you can see with your telescope.()()()()()()()()()()()()()()()()Today's DefinitionAngular momentum is a momentum-like quantity associated with a circular motion around an axis of rotation. Essentially, it is the amount of spin an object has. Formally, Angular momentum = mass x velocity x radius (from point that the object is spinning or orbiting around). Angular momentum is conserved (in the absence of an outside force). ()()()()()()()()()()()()()()()() The lights in our modern world called light pollution, diminishes the ability to see the stars. That is why most observatories are usually away from civilization. But even that limits our vision.The incredible number of stars in all the galaxies that were known greatly increased with the first telescopes in space. Without the atmosphere those who study the stars finally got a real idea of the real number of stars in the sky.In fact, Carl Sagan estimated that there were 100 billion galaxies in the universe. If you consider that there are about 41452 stars in any one galaxy, you begin to get a glimpse of how many stars that were considered to exist then.These quotes will give you an idea of how the number of estimated galaxies has increased:"Studies of distant space with optical and radio telescopes indicate that there may be about 100 billion galaxies in the universe." - World Book Encyclopedia. Chicago: World Book, 1997: 205."The latest estimates have ranged anywhere from ten billion to one hundred billion galaxies." - The Rebirth of Cosmology. New York: Knopf, 1976: 187."The Hubble Space Telescope has found there may be 125 billion galaxies in the universe." - Galaxy Estimate Up To 125 Billion. Far News. Far Shores. citation of South China Morning Post. 9 January 1999.Now in fact, a german supercomputer estimates that there are probably 500 billion galaxies. If we take the number 40,000 stars per galaxy, that would make over 10 stars for every grain of sand on earth.
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The Number of Stars Eleven hundred years ago, the number of stars you could see would have been about 2400 at any one time. So through most of history, the real number of stars known were just the brightest ones. With the invention of the first telescope the number of stars increased to just about
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