what are the properties of star?what are the star groupings?what is the milky way?

Question

pls in have to understand this properties of star if not,i am dead of my report this coming next week

Answer 1

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.

From these absorption lines you learn some important things beside the star's composition:

Structure 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.
mass of stars:
To 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.
colour of star:
Hot 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.
A 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:

Measure the apparent brightness (flux) with two different filters (B, V).
The flux of energy passing through the filter tells you the magnitude (brightness) at the wavelength of the filter.
Compute the magnitude difference of the two filters, B - V.

ok thats all,

Answer 2

I'll be quick.
O Be A Fine Girl Kiss Me Right Now Sweetest
OBAFGKMRNS
that's the star groupings. each letter stands for a class of star. our sun is a G class of star. it is in the mid range of stars, not very hot or big and nice and yellow. all in all, very temperate. The Milky Way is a Galaxy, made up of about 200 million stars and it rotates slowly at a period of about once every 200 million years. the stellar core is packed with stars and the ambient light and radiation there probably increases at geometric ratios. it has been theorized that within there, there is no night.
A star begins with a ready supply of hydrogen, once having achieved the mass to begin a self sustaining thermonuclear fusion reaction. as the star's life goes on, the sun puts out about1350 watts per square meter on earth's surface. the hydrogen changes to helium in the solar core. helium burns too, so eventually the sun puffs up, becomes a red giant and starts to form heavier elements. by the time this happens it will have consumed us inside itself as it makes boron carbon oxygen and nitrogen. when the nuclear burn stops, all that will be left will be iron. it will collapse inwards and become a 'white dwarf' and it will disappear into space. Note; sometimes, bigger stars collapse into themselves at the end and they blow off their iron core and become supernovae.

Answer 3

i'm no longer conscious of the poem, and "careful celeb" is only a line in this poem, no longer an valid nickname for any celeb. although, going by the context of the poem "Lead me", i'd assume that's concerning Polaris, the North celeb, which has been used for navigational applications for hundreds of years.

Answer 4

Search all of those things on Wikipedia and do your own report. Surely you can type a few words?

http://en.wikipedia.org/wiki/Main_Page

Answer 5

http://en.wikipedia.org/wiki/Star

http://en.wikipedia.org/wiki/Milky_way

There is just toooo much to say here about both of those topics. But I mean wikipedia has such nice articles on both of them so maybe you should read from there.

Answer 6

their color:red, blue or white.i'm not sure.White is always called dwarf.Milkyway is the galaxy we are in to. Where our solar system may be found...

Answer 7

ask.com, yahoo.com, google.com, try lots of search engines