If the stars don't move, as some suggest, why not?
605687
The stars do move. The motion of a star in space is measured by astronomers in two ways. They use a spectrograph to measure the Doppler shift of the Star's light to determine the redial velocity, which is how fast the star is moving toward or away from the Earth. And they take careful position measurements with telescopes to determine the proper motion, which is the sideways motion in the sky. The star with the fastest proper motion is Barnard's Star, which is only moving at 10.3 arc seconds per year. That is only one degree every 350 years. Yet the star's speed though space is 750,000 miles per hour! It just looks slow from Earth since it is so far away.
558983
It is due to the earth's orbit around the sun. At night, we are looking in different directions over the course of a year. The stars stay in the same positions over long periods of time.
1121215
carljoseph has the correct answer.  The galaxies have no reason to stop spinning any more than the planets have a reason to stop orbiting the sun.  (Eric p, I don't know why you think the law of perpetual motion does not apply to circular motion.)  There is no continuous force that *keeps* them in motion ... it's just momentum from the process that formed the  galaxies (or the solar systems), and there is no counter-force (like air resistance) slowing them down.  Now it's possible that there is infinitessimal resistance due to space dust, but there's nothing in the laws of physics that says that a rotating object (like a galaxy or a solar system) must eventually stop rotating.  So they will continue to turn indefinitely.\n\nNow, some of these stars will explode at some times in their lifespan, and may or may not leave behind the burned out shells (mostly iron, the most stable atomic nucleus there is) of dead stars and planets, but the galaxies will continue to spin as long as there are stars (or star remnants) in them.
618210
Not due to gravitational pull?!
516685
gravity shows them to move and rotate. the hubble space telescope has pics that show it in time lapse of course.
940470
Possible, maybe. Likely, definitely not. The problem with flare stars (I assume you're talking about red dwarfs) is that any planet that orbits one has to orbit extremely close in order to receive enough heat to have liquid water on its surface (which is supposedly a precursor to life). At this range from the star, the planet will probably experience tidal lock, which would mean one side perpetually faces the star. The main problem is that at that close a range, any flare on the star could dramatically increase the brightness within minutes. Under unstable conditions like this, it is unlikely that advanced life would have the chance to evolve, because it is thought that advanced life needs to evolve under a relatively stable climate.
946537
If you mean "Why do the stars appear to move?", it's a combination of the rotation of the earth on its axis, (that causes the apparent daily motion of the stars), and the revolution of the earth around the sun (that causes the apparent yearly motion of the stars).  The star really do move slightly, but you can't see it with your eyes, over your lifespand, from earth.\n\nIf you mean "How do the stars appear to move through the sky", what we see is that it appears as if there were a giant sphere surrounding the sky, with the stars fixed on it.  This sphere appears to rotate almost once every 24 hours.  In the northern hemisphere, it appears to rotate around the fixed north star.\n\nThe "almost 24 hours" kicks in by making the starscape shift 4 minutes every day, meaning that the stars that are visible at night now will, in six months, be in the sky above you at the same time the sun is, and a new set of stars, which currently isn't visible becuase they are only above us when the sun is also out, will be visible in six months.\n\nThe apparent paths of the sun and moon and other planets is a little more complicated.\n\nI highly recommend a book called "The Stars" by H.A. Ray.  It has a really easy to understand explanation of how all the stars and planets appear to move through the sky, and why.
1113063
No. It's the gravity they can't escape. (Light is ultimately made up of particles.) Speed is not an issue.
725422
They can fall anywhere on the H-R diagram. The age and the temperature of the star are located on the axes, but the distance of the star isn't mentioned.\n\nAlso, say the ratio of stars visible to the naked eye and stars visible with a telescope is f/g (g obviously being bigger). This ratio is differenciated by brightness*nearness, where brightness*nearness has to be greater than a certain number to be visible by the naked eye. Since most stars are main sequence stars, the graph of stars can look like this:\n\n....*..............*............*.M\n................*........*.*M..*..\n......*............*..M..*....*...\n..*............*M..*.......*......\n........*..M.*..*.........*.......\n.*..*M.*....*.....*...........*..\n\nAs you can see, most stars are on the diagonal that cuts from the bottom left to the top right M's. If you randomly take away a  number of stars, then the diagonal will most likely be there. Thus, most visible stars are near the graph of (f*brightness/g*nearness) which is the diagonal.
490197
All stars really circle the North Star (also known as the Polaris or Alpha Ursae Minoris), and they are only really apparently circuling because of the rotation of the Earth.\n\nWhether those stars rise or set depends on your latitude. Although the North Star is only visible in the northern hemisphere.
620559
If stars twinkle due to the atmosphere, then why the planets and moon do not twinkle?\n\nTwinkle, twinkle, little star, how, I wonder, what you are?\n\nOn a clear night only about 2000 stars are visible to the naked eye.\n\nThe nearest star, Centauri, is at a distance of 4.3 light years; that is at a distance of about 2, 60,000 times the distance of the sun.\n\nEven this nearest star appears to be a point from earth.\n\nTherefore, a point image is formed in the retina our eye, that is they fall on very few rods of our eye. \n\nEven a sight turn of eye ball will shift the image position in the retina. This causes the twinkling effect of stars.\n\nBut if we view a star continuously we can’t feel the twinkling effect. \n\nHowever, some stars vary their brightness periodically; they are long period variables and short period variables. Their period varies from a week to months.\n\nHence they are not the cause for twinkling.
217791
What stable? You can't see the storms so you think its stable. Many big stars disappear, only God knows how long this earth is here.
7163
Very easy stars are perform nuclear fission, planets do not.
988087
Gravity does not travel; it is a force that varies depending mostly on the size of the bodies in question.
156280
no...stars are not planets, they are comprised primarily of extemely high and volatile gases that burn without oxygen.
744695
Thermonuclear reactions need enormous pressure.\nYou cant have so much pressure on the surface of the star.
719853
newton discovered it.but Einstein proved it is not.one day he photograph the stars continuously at one photograph it's slightly move in zig zag.