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It is estimated that there are as many as 200 billion galaxies in the observable universe, but we aren't able to see all of them yet as our telescopes are not big enough. This number is interesting because it is similar in magnitude to the number of stars estimated to be in our Galaxy.
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curious.astro.cornell.edu/question.php?number=40
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We have written many articles about galaxies for Universe Today. Here's an article about the number of stars in the Milky Way, and here's another about the number of stars in the whole Universe.
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www.universetoday.com/guide-to-space/galaxies/how-many-...
www.universetoday.com/guide-to-space/galaxies/how-many-galaxies-in-the-universe/
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The first known galaxies were longly known before their nature as "island universes" came to light - this fact was finally proven only in 1923 by Edwin Powell Hubble, ... Back 6 billion years in time, many more interacting galaxies and mergers are observed, ... Galaxies and the Universe - WWW Course Notes by Bill Keel...
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www.seds.org/messier/galaxy.html
www.seds.org/messier/galaxy.html
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The universe is made up of many galaxies. When galaxies were first discovered they were called island universes because they looked like islands of stars in a dark sea. New galaxies are discovered every day containing large numbers of stars.
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hypertextbook.com/facts/1999/TopazMurray.shtml
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Ignoring such factors as absorption by dust in our own Galaxy, which make it harder to see outside in some directions, the Hubble telescope is capable of detecting about 80 billion galaxies (although not all of these within the foreseeable ...
http://www.faqs.org/faqs/astronomy/faq/part8/section-4....
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These are so faint that the closest, Proxima Centauri, despite being closer to the Sun than any other (known) star, ... Top Document: [sci.astro] Galaxies (Astronomy Frequently Asked Questions) (8/9); Previous Document: H.00 Galaxies, Clusters, and Quasars (QSOs); Next Document: H.01.2 How many galaxies in the Universe?;
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www.faqs.org/faqs/astronomy/faq/part8/section-3.html
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Galaxy is a system of stars, dust, and gas held together by gravity. Galaxies are scattered throughout the universe. Galaxies range in diameter from a few thousand to half a million light-years. A light-year is the distance that light trave...
http://www.experts-exchange.com/Other/Philosophy_Religi...
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According to the Physical Universe textbook,approximately 200 billion.
http://wiki.answers.com/Q/How_many_galaxies_in_the_univ...
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Light which has been split up to create a spectrum is called dispersed light. By dispersing light, one can see how pure white light is really made ... To split up the light so you can see the spectrum, ... We will be using an optical element called a diffraction grating to split a source of white light into its component colors.
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ganymede.nmsu.edu/astro/a110labs/labmanual/node115.html
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