How come when you look out at the city the lights twinkle?
337135
It is because of the air bending the light slightly. Its the same as shining a light through water, but the effects are less pronounced.
461917
why does it have to be so dam sunny in Vancouver
211343
For When You Open Your Eyes A New Twinkle Is Highlighted Within Our Cosmos, So For ME To Percieve Those Sparkley Lights, I Wait For You Too Open Them Eyes\n\nSo Im Guessing A Lot Of Glactic Dust Is Twinkling As You Blink And Read This - I Thank You For The Twinkle\n\nAlien Love
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.
330623
The spiky shape you perceive is due to imperfections in your own eye. Twinkling, which is due to turbulence in the atmosphere, also adds to the spiky look.\nThe spikes you see in some photographs are due to diffraction from parts of the telescope used to take the pictures.
116508
Because you look up in the sky and they look like they are going around us?
416939
There are chemicals in the air and its just how the light might have been bent. There are tons of different atmospheric problems that could have caused that.
300540
Observed from Earth’s surface, stars appear to twinkle because the atmosphere bends light on its way to the ground.  Stars are so far away that they appear as points of light in the sky, so when the atmosphere bends light from a star, it actually prevents the light from the star from reaching our eyes entirely—in other words, the tiny beam of light from the star that could reach our eyes at that point in time gets deflected away from our eyes briefly.  Thus, stars appear to twinkle on and off.  At one instant, a star’s light reaches your eye; at the next instant, it doesn’t.\n\nThe sun is simply too large to twinkle.  Yeah, one beam of light may get scattered away (perhaps to enhance the blueness of our sky), but the beam of light next to it will make it to your eyes, and on average, the whole sun appears nice and bright and untwinkling in the sky.  (Likewise, the moon doesn’t appear to twinkle, either.)\n\nIn space, there’s no atmosphere, no air to change the trajectory of light reaching your eyes (assuming your eyes are safely enclosed in a spacesuit with the rest of you), so the stars will not twinkle.  \n\n\nRyan Wyatt\nRose Center for Earth & Space\nNew York, New York
515706
The atmosphere is made up of several layers,each one with a varying density.Thus,the speed of light differs in different layers of the atmosphere and the light gets refracted(deviated from its path when it travels from one medium to another)when passing from one layer of atmosphere to another.Due to this refraction of light in the different layers of the atrmosphere,stars appear to twinkle
199846
You are holding a metal rod...there is lightning all around. Metal rods attract lighting. You are holding a metal rod.
307165
Electric static in the air causes lightening to flash over the water.
17005
Stars seem to "twinkle " because of heat waves in the atmosphere .  They twinkle less in cold weather than in warm .
654051
Neither one actually blinks.  Satellites are visible at night because they reflect sunlight hitting them just like the moon does.  Stars emit their own light, but are hundreds of millions to billions miles away, and so the light from those giant suns looks like tiny pinpricks in our sky.\n\nThe blinking and twinkling of the lights of these bodies is due to shifts in the atmosphere.  Different temperatures of air and smog/pollution from cities create variations in the atmosphere that cause the light to bend, shift and warble on its way to us.  This tends to be more noticeable when observing stars because the relative size of the light source is so much smaller when you compare the percentage of the sky they take up.  A small patch of warm air passing between you and Betelgeuse can make it seem to blur and twinkle.\n\nSo either one can 'blink', but it's a quality of the atmosphere in between you and what you are viewing, and not a feature of the light coming from the object.
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.
401971
when the light from the stars enter the earth's atmosphere, the light wave bends and refracted until it reach our eyes. So because it is refracted, when we look at it, it seems to be twinkling.
480333
natural LIGHTING comes from the sun,\notherwise, usually from an electric light bulb\n\nHowever, LIGHTNING, is a dual attraction between the sky and the ground, but physically speaking the negative charge in the sky is seeking out a positive charge on the ground, the LIGHTNING comes FROM THE SKY.\nHowever, you may not often see this and since there is a return of the lightning energy back up to the sky, (to balance the energy) so if you look after the sound of thunder you are seeing the return.
711264
regent street lights were turned on the other day...\n\nthey are themed around some animated kids film...festive eh?