Why do the stars sparkle? (star if you think appropriate please)?

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Holly Dolly™

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I was just looking out of my window earlier and I wondered why they sparkled so much and why some are so bright?
Please answer!
 
Stars twinkle or scintillate (i think thats the word youre looking for) because of turbulence (sort of moving air) in the Earth's atmosphere. The light is refracted (bent) in different directions This causes the star's image to change slightly in brightness and position and twinkle. The Hubble Space telescope is so successful because it is out of the atmosphere of the earth so the stars dont twinkle.
some are bright because they are closer to us or bigger. Sirius is a star not much bigger than the sun but it appears very bright because it is close to us. Betelgeuse is a star that is quite far away from us. It appears bright because it is so big.
 
there are different stars in the universe. stars are sun. Some are brighter cuz stars eventually died out depending on what type of star it is the older the star the less it will shine cuz it's dimming out to either a white dwarf or black hole. and stars are far away from us and the closest star to us is the sun
 
there are stars of different size and different distances to us. that explains the brightness.

i think that the twinkle comes from the process of viewing the light through our atmosphere. maybe???
 
Stars "twinkle" because of variations in the Earth's atmosphere. It's like looking up from the bottom of a swimming pool.

Some stars are brighter than others because they are big, or because they are relatively close to us.
 
Well stars give out light from all the chemical reactions taking place in them, these reactions give out light energy. We see stars through lots of moving air surrounding the earth. Light is of air, this makes the light from the star look like it's moving (like looking through a heat haze at things) and that's the twinkling effect.

"Stars closer to the horizon appear to twinkle more than stars that are overhead - this is because the light of stars near the horizon has to travel through more air than the light of stars overhead and so is subject to more refraction. Also, planets do not usually twinkle, because they are so close to us; they appear big enough that the twinkling is not noticeable (except when the air is extremely turbulent)."

"Stars wouldn't twinkle if we viewed them from outer space (or from a planet/moon that didn't have an atmosphere and therefore no air to refract the light)."

The brightness depends on their size, distance from earth and how old the star is...what stage of life it's in. The brightest "stars" will be planets, mars and venus.
 
they sparkle due to dust,both in the atmosphere and in outer space.They can differ in brightness due to both,size and distance,and magnitude
 
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