I want to answer about the stars of the galaxys,their magnitude,their colour,constellations,position in sky a?
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Check out the TV show NOVA on PBS.
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This should help you:  http://www.le.ac.uk/physics/faulkes/web/stars/o_st_overview.html
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Not often enough. When I was homeless living in my car, I would study the constellations, try to remember the name of each star in Orion. I had a star chart. If it were not for thieves, I would live in a tent again, watch the possums and raccoons come out at night, feed and watch the birds by day, and stare into the stars at night. My dream home though would have a lighthouse top with windows all around and a telescope. Enjoy your time outdoors, and try to learn the names of as many stars as you can, for me. I don't know when or if I'll ever get the time to enjoy them like I once did again.
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milky way is our own galaxy.sThe compositions of stars are determined through spectroscopy. Spectroscopy is the study of something using spectra. Recall from the electromagnetic radiation chapter that a spectrum is what results when you spread starlight out into its individual colors. By noting what absorption lines (or sometimes, emission lines) are present and their strengths, you can find out a tremendous amount of information. Stars have absorption lines patterns similar to the Sun. This means that they are composed mostly of hydrogen and helium with traces of other elements. \n\nFrom these absorption lines you learn some important things beside the star's composition: \n\nStructure of stars: From the simple fact that you see absorption lines in most stellar spectra, you know that the stars must have a hot dense part that produces a continuous spectrum and an outer layer, or atmosphere, made of cooler, low density gas. The general trend is density and temperature of stars decreases as the distance from the star's center increases. The hot dense part is also gaseous because of the extreme temperatures. Stars have no molten rock in them like the interiors of some of the planets. \nmass of stars:\nTo determine the masses of stars, Kepler's third law is applied to the motions of binary stars---two stars orbiting a common point. The greater the combined mass of the two stars, the greater the gravity acceleration is, and, therefore, the smaller their orbital period. A majority of the several hundred billion stars in the Galaxy are in a system with two or more stars orbiting each other. Usually the binary stars are spectroscopic binary stars. A spectroscopic binary system is two stars orbiting a common point at too great a distance away from us to resolve the two stars individually, but whose binary nature is indicated in the periodic shift of their spectral lines as they orbit around each other. Spectroscopic binary stars are used because (a) there are a lot more far away stars than nearby ones and (b) more importantly, you can easily measure their speeds from the doppler shifted lines. \ncolour of star:\nHot stars appear bluer than cooler stars. Cooler stars are redder than hotter stars. The ``B-V color index'' is a way of quantifying this using two different filters; one a blue (B) filter that only lets a narrow range of colors or wavelengths through centered on the blue colors, and a ``visual'' (V) filter that only lets the wavelengths close to the green-yellow band through. \nA hot star has a B-V color index close to 0 or negative, while a cool star has a B-V color index close to 2.0. Other stars are somewhere in between. Here are the steps to determine the B-V color index: \n\nMeasure the apparent brightness (flux) with two different filters (B, V). \nThe flux of energy passing through the filter tells you the magnitude (brightness) at the wavelength of the filter. \nCompute the magnitude difference of the two filters, B - V. \n\nok thats all,
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The observable universe is estimated to contain:\n10^11 galaxies, 10^21 stars, and 10^78 atoms.\n\nThe means 100,000,000,000 galaxies.
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look at the stars in th upper left hand corner
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http://www.windows.ucar.edu/tour/link=/the_universe/Constellations/north_constellations.html\nhttp://members.aol.com/ckckside/reports/constellation/astrod.htm\nhttp://domeofthesky.com/clicks/constlist.html\n\nThe above sites show details. Quite informative.
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http://en.wikipedia.org/wiki/Astronomers
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Star name/Solar System Generators\n\nhttp://home.comcast.net/~brons/NerdCorner/StarGen/StarGen.html\n\nStar Maps\n\nhttp://www.fourmilab.ch/yoursky/\n\nhttp://csep10.phys.utk.edu/astr161/lect/time/maps.html\n\nhttp://www.skymaps.com/
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A constellation is any grouping of stars that (when connecting the dots) form a picture\n\nUrsa Major (The Big Bear - The Big dipper is in this)\nUrsa Minor (The little Bear - The little dipper is in this)\nDraco\nOrion\nThe Muses\nScorpio
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Consider this there are billions upon billions of stars in each galaxy we are just 1 galaxy and there are billions upon billions of galaxy's in the universe. So the question should start with the universe.
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Types Of Galaxies\n\nGalaxies come in three main types: ellipticals, spirals, and irregulars. A slightly more extensive description of galaxy types based on their appearance is given by the Hubble sequence. While the Hubble sequence does encompass all galaxies, it is entirely based upon visual morphological type. Hence, it may miss certain important characteristics of galaxies such as star formation rate.\n\nOur own galaxy, the Milky Way, sometimes simply called the Galaxy (with uppercase), is a large disk-shaped barred spiral galaxy about 30 kiloparsecs or 100,000 light years in diameter and 3,000 light years in thickness. It contains about 3×1011 stars and has a total mass of about 6×1011 times the mass of the Sun.\n\nIn spiral galaxies, the spiral arms have the shape of approximate logarithmic spirals, a pattern that can be theoretically shown to result from a disturbance in a uniformly rotating mass of stars.\n\nLike the stars, the spiral arms also rotate around the center, but they do so with constant angular velocity. That means that stars pass in and out of spiral arms. The spiral arms are thought to be areas of high density or density waves. As stars move into an arm, they slow down, thus creating a higher density; this is akin to a "wave" of slowdowns moving along a highway full of moving cars. The arms are visible because the high density facilitates star formation and they therefore harbor many bright and young stars.
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Look at the website   http://www.heavens-above.com/  \n\nPlug in your location info (bookmark it) and you'll get all the local astronomical information you need.
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Try red, white and blue stars!  That would be cute.
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Our Universe is the only one that we know of.  Within our universe are at least a hundred billion galaxies.  Within our galaxy (assuming it is normal) there are a hundred billion stars.  That gives us (assuming the averages hold true) roughly 10,000,000,000,000,000,000,000 (ten sextillion) stars in the known universe.
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200 billion stars in the Milky Way.
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A galaxy is a swirling collection of stars. our own Milky Way galaxy contains hundreds of billions of stars, of which our sun is only one amongst these billions and billions.\n\nA solar system is just a single sun that has planets revolving around it. A galaxy is made up of billions of such suns. And some scientists believe that as many as 25% of the stars could have planets. That means billions and billions of solar systems in our own galaxy.\n\nHere'a a picture of our closest neighbor, the Andromeda galaxy. It has close to one-trillion stars.\n\nHope this heolps. Cheers\n\nhttp://en.wikipedia.org/wiki/Andromeda_Galaxy