Why star are seens to twinkle?
90070
Simple, it's just an atmospheric effect, they really don't twinkle. It's kind like seeing a tree in middle of an hot desert, with the hot air rising from the ground, the tree seems to move..
137132
When someone speaks above the water, the person underwater will hear it "twinkle" in exactly the same way and for the same reason as stars twinkle.\n\nSound undergoes various effects when it hits the surface of water including reflection, refraction and dispersion. the specifics of what happens depends on the volume of the sound, the surface shape of water (which tends to be irregular and turbulent, more so with a person under it) and the depth of water between surface and listener.\n\nthe listener will end up hearing a very distorted version of the speech with varying loudness, just like twinkling stars.\n\nnow will the listener be able to understand what is being said is a slightly different question. you can take it safely that if the speaker were reciting poetry, the listener will barely understand. but if the speaker were standing, with a horrified look on the face , point out far, and *screams* something that sounds to the underwater listener like sh--k! the listener will get the message :P
23967
Stars are massive, glowing balls of hot gases, mostly hydrogen and helium. Some stars are extremely hot, while others are cooler. You can tell by the color of light that the stars give off. If you look at the coals in a charcoal grill, you know that the red glowing coals are cooler than the white hot ones. The same is true for stars. A blue or white star is hotter than a yellow star, which is hotter than a red star. Temperature of stars range in the high hundreds to thousands degrees F. So to touch the stars that are in the sky is almost impossible, as your body would burn due to high temperatures surrounding them.
13842
They are a cluster of stars in the north, that light up the sky beyond imagineing. City goer's have no clue of the beauty the stars can have due to light pollution. Light pollution makes the stars not shine as bright or as many. There are much much much more stars visible than what i see where i live. also, northern lights is a strand of marijuana. Very very good marajuana. some say best in the world, it grows in canada or upper penninsula of michigan
1113645
A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light.  When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.\n\n\nBecause the universe is not infinitely old, that puts a limit to how long the\nlight from all those stars can have travelled. So some of the light has not\ngotten here yet. Because stars do die out, that means that their light dies\nout too - which means that we may get the light from some stars at one time,\nand the light from some other stars at a different time, but not all the \nlight\nof all the stars that everywhere put together. Finally, because the \nuniverse is\nexpanding, the light gets weaker before it gets to us. All in all, this means\nthat there is not enough light from all those stars to make any point in \nspace\nbright.
725115
These galactic clouds only glow if there are hot stars to stimulate them. The gas in the cloud  glows in a way similar to the gas inside a fluorescent lamp, but it's ultraviolet light, not an electric current, providing the stimulation.  Typically, it is very hot O and B stars formed within the cloud that provide the stimulation.\n\nPortions of the gas cloud away from these bright stars are dark. You can see this in M42, the great Orion nebula. The dark areas in that nebula are actually parts of the cloud obscuring brighter parts of the same cloud behind them.
471007
Because stars are not very bright. In the day time, scattered sunlight makes the sky a bright blue, brighter than the stars. Even bright streetlights are enough to overwhelm the dim starlight.
789785
The stars themselves don't.  It is just an illusion.  The miles of air in our atmosphere between our eyes and the star changes in temperature and humidity which makes the star look like it is flickering when it really glows at a constant rate.
83573
As all the others said, the sun is a star, and you see it every day. Sometimes, in early morning or in late afternoon, some of the most prominent start may be visible, mostly on the horizon.\n\nAll the stars which you can see by night is still there during the day, but the sun's light is so bright that we cannot see past its brightness to where the stars are.\n\nI once heard in an astronomy class that it is able to see a star in the day, but the light of the star has to fall directly in the mid-center of your eye, and that takes some doing.\n\nLastly, there are certain occasions where stars are visible during the day. I remember when I was in primary school, the Planet Venus (although not a star) was visible next to the moon right in the middle of the day. If Venus can be visible at that time, then why not any other star?\n\nHope I could help you...
17005
Stars seem to "twinkle " because of heat waves in the atmosphere .  They twinkle less in cold weather than in warm .
231023
This is caused by thermic convection of the air. In the deserts you normally have high differences in temperature between day and night, so hot air is rising rapidly while cold air is moving downwards after sunset. This different densities in the air makes the light bend and the stars seems as if they are dancing, just as if you were looking through an irregular glass. \nIt's a bad night for astronomers.
650511
None, they up in the Sky, best seen at night. The Earth does revolve around a Big Star that can actually be seen in the day and not night. Make for a good Word Play/Riddle question. ;-D
496226
STARS AND NEBULAE.\n\nMost of the things you can see in the night sky are stars: a few thousand are visible to the unaided eye. A star is a hot ball of mostly hydrogen gas; the Sun is an example of a typical, ordinary star. Gravity keeps the gas from evaporating into space, and pressure due to the star's high temperature and density keeps the ball from shrinking. In the core of the star, the temperature and densities are high enough to sustain nuclear fusion reactions, and the energy produced by these reactions works its way to the surface and radiates into space as heat and light. When the fuel for the fusion reactions is depleted, the structure of the star changes. The process of building up heavier elements from lighter ones by nuclear reactions, and adjusting the internal structure to balance gravity and pressure, is called stellar evolution. \nLooking at a star through a telescope can tell us many of its important properties. The color of a star tells us its temperature, and the temperature depends on some combination of the star's mass and evolutionary phase. Usually, observations also allow us to find the luminosity of the star, or the rate at which it radiates energy as heat and light. \nAll stars visible to the unaided eye are in our galaxy, the Milky Way. The Milky Way is system of roughly 100 billion stars, along with a great deal of interstellar material. The galaxy is shaped like a flattened disk embedded in a round, faint halo. Gravity keeps the stars from drifting away, and the motions of the stars keep the system from falling in on itself. The Milky Way has no distinct edge - the distribution of stars tapers off gradually with increasing distance from the center. The SDSS detects stars more than a million times fainter than can be seen with the unaided eye, far enough to see the outer structure of the Milky Way. \nStar Colors and Luminosities: The H-R Diagram\nAstronomers often make plots of the luminosities of stars compared to their colors. The first such charts were made in the early twentieth century, when astronomers took spectra of thousands of stars, then placed the spectra into a sequence based on the appearance of several different features. The classes of stars were given different letters as names; in order of decreasing temperature, they are OBAFGKMLT. The hottest stars are class O, while the coolest are class T. Two astronomers, Ejnar Hertzsprung and Henry Norris Russell, independently started to wonder what would happen if they compared stars' luminosities to their spectral classifications (or, alternatively, to their temperatures). They knew that some stars were hotter and more luminous than the sun, and that others were cooler and less luminous. Hertzsprung and Russell found that 90% of the stars fell into a narrow band they termed the "main sequence." Today, we call this type of plot a Hertzsprung-Russell (or H-R) diagram. \nAstronomers further divide each letter into ten categories from 0 to 9, with 0 being the hottest star in that spectral class and 9 being the coolest. So, a B1 star is hotter than a B2 star, and a B9 star is hotter than an A0 star. Our own sun is at the "hot" end of the G range with a surface temperature of 5,770° K; therefore, it's called a G2 star. \nSpectral classes give us a convenient way to refer to most types of stars - from O0, the hottest at over 25,000° K, down to T9, the coolest failed stars at 1,000° K. Each spectral type of star is associated with a specific color: all G-type stars like the sun are yellow, all M-type stars appear red, and all B-type stars are bluish. Thus, this system of letters and numbers tells us where a star is on the horizontal (color or temperature) axis of the H-R diagram. \nTwo alternative systems tell us approximately where on the vertical (luminosity) axis a star can be found. One system uses absolute magnitude, a measure of luminosity derived from the apparent magnitude, or brightness of the star
387444
Not really, but they look like twinkling because moving particles from space block the light that we see from down here so it looks like it's twinkling...Hope you understood my answer...sorry...
138088
The hubble telescope it up above all the atmospheric disturbance, allowing for much higher quality photos.\n\nFor the same reason stars twinkle, land based telescopes have a limited resolution power, after a certain size, it doesnt really help any (unless you want to build a complicated atmospheric correction machine to adjust the mirror to compensate).
465188
Aurora can also look like waves or ripples going through the sky.  I think radiating away from the pole.  That's the only kind I've seen, but it was cool and really weird.
537296
Mainly because the sun is so much closer than any other star. The twinkling effects our atmosphere causes on other stars is simply overcome by the brute force of sunlight.\n\nDistant stars twinkle due to Earth's atmosphere, but then why don't planets also twinkle; they look to be about the same size? Here's a good explanation I cut-and-pasted for you from an astronomy website --\n\n"Just like a computer screen, your eye is composed of a certain number of 'pixels,' each represented by a single light-receptor cell in your retina. If two (or more) points of light are close enough such that they are focused on the same receptor cell in your eye, you will experience them as a single point of light. This is the 'resolution' of your eye. \n\nNow, a star on the sky is in a true sense a single point of light. All the light comes through the atmosphere in exactly the same direction, through exactly the same atmospheric turbulence, and thus is bent in exactly the same way. So when it gets to your eye, the amount of light you see varies. It also strikes (primarily) only a single receptor ('pixel') in your eye. \n\nOn the other hand, light from a planet is different. Each of a few receptors in your eye sees a large number of light rays coming from the planet, each of which has been bent differently by the atmosphere (since the planet has size on the sky, they are arriving in slightly different directions). Some of these rays will become brighter, some dimmer. But because they all illuminate the same receptor in your eye, that receptor only sees the total amount of light hitting it. There will be about the same number of enhanced rays as dimmed rays, so you experience a steady light, not a twinkle."