Why arent stars green?

Question

Why arent stars green?

Answer 1

because they are not??

Answer 2

THEY ARE!

Answer 3

white was there first

Answer 4

because there not

Answer 5

Stick those thumbs-down up your as$

Answer 6

why would they be lol :]

kiwi.cake

Answer 7

cause i dont like green

Answer 8

r u serious?

then y isnt the grass blue?

tree's purple?

lol GOD MADE IT THAT WAY

Answer 9

why the sun is orange

Answer 10

why not ask god?

Answer 11

Because they are white

Answer 12

because a copper star doesn't shine bright, they are there

Answer 13

Why aren't there any green stars?

The color of a star is a combination of two phenomena. The first is the star's temperature. This determines the wavelength (frequency) where the peak of its electromagnetic radiation will emerge in the spectrum. A cool object, like an iron rod heated to 3000 degrees, will emit most of its light at wavelengths near 9000 Angstroms ( the far-red part of the visible spectrum) in wavelength. A very hot object at a temperature of 30,000 degrees will emit its light near a wavelength of 900 Angstroms (the far-ultraviolet part of the visible spectrum). The amount of energy emitted at other wavelengths is precisely determined by the bodies temperature, and by Planck's radiation law of 'black bodies'. Below is an example of a black body spectrum courtesy of Prof. Michael Bolte' at the University of California Observatories/ l**k Observatory (www.ucolic.org):

It shows that as the temperature of the object increases, the peak shifts further to short wavelengths. But the phenomenon we call 'color' is another matter. Color does not exist as an objective property of nature.

Color is a perception we humans have because of the kinds of pigments used in our retinae. Our eyes do not sense light evenly across the visible spectrum but have a greater sensitivity for green light, and somewhat less so for red and blue light as the response spectrum below illustrates:

In effect, what you have to do is 'multiply' the spectrum of light you receive from a heated body, by the response of the eye to the various wavelengths of light in the spectrum. When this happens, a very unusual thing happens.

If I were to figure out how hot a star would have to be so that the peak of its emission was in the 'green' area near 4000 Angstroms, I would estimate that the temperature of the star would have to be about 10,000 degrees. There are many such stars in the sky. The two brightest of these 'A-type' stars are Vega in the constellation Lyra, and Sirius in Canes Major. But if you were to look at them in the sky, they would appear WHITE not green! Stars are ranked according to increasing temperature by the sequence of letters:

Type..... Color...............Temperature

O........ blue................30,000

B........ blue-white..........20,000

A........ white...............10,000

F........ yellow-white........ 8,000

G........ yellow.............. 5,000

K........ orange.............. 4,000

M........ red..................3,000

This is NOT the same sequence of colors you see in a rainbow (red, orange, yellow, green, blue, indigo, violet) because the distribution of energy in the light source is different, and in the case of the rainbow, optical refraction in a raindrop is added.

Another factor working against us is that we see stars in the sky using our black/white rods not our color-sensitive cones. This means that only the very brightest stars have much of a color, usually red, orange, yellow and blue. By chance there are no stars nearby that would have produced green colors had their spectral shapee been just right.

So, there are no genuinely green stars because stars with the expected temperature emit their light in a way that our eye combines into the perception of 'whiteness'.

For more information on star colors, have a look at the article by Philip Steffey in the September, 1992 issue of Sky and Telescope (p. 266), which gives a thorough discussion of stellar colors and how we perceive them.  

Answer 14

there are ones, but  green is the hardest color to see in to color spectrum. we simply cant see them

Answer 15

The 'colour' of a star is in fact the wavelength of the rays that are passing through our atmosphere before they reach our eyes. In outer space, there is no color as there is no atmosphere for the light waves to pass through. The only reason a star (or planet) appears a particular colour is the atmosphere through which the light waves from a star or planet are passing through,

Answer 16

im pretty sure stars can be green. because some stars are blue. so it's probably possible.  

Answer 17

Because stars are mostly made of hydrogen and helium, and by combining those two gasses, the colour doesn't come out as green. Stars are either red or yellow, depending on the heat/temperature of them. Look at this website: http://www.qrg.northwestern.edu/projects...

Yeahh.. so that's why they aren't green:)

Answer 18

Because you would need a special dust around the star to absorb the other colors to let only green out.

Red, white and blue are just the result of the blackbody radiation caused by the star (except the radiation absorbed by the plasma of the star). They appear white, when their light spreads all other the visible spectrum of our eyes, red, when the spectrum of the star shifts more towards the longer wavelengths (infrared) and blue when it becomes so hot, that the wave lengths become short and shift into the ultraviolet region, so only the blueish color is left for our eyes to be seen.

Answer 19

They are either white or red, in relation to their heat temperature

Answer 20

Ummmm..'cause green doesn't look hot? as in high temperature..

I mean flames are supposed to be orange and red and blue,tight?

Don't ask me about white stars.. XD

Answer 21

Because stars don't emit light of that wavelength.

Answer 22

a star may become green if gases from the core of a blue supergiant are expelled out to the surface. since nitrogen and sodium are green in plasma form(as tested by atomic absorption spectrometry) it would be possible for these green gases to envelope the star's surface giving it a green hue. such things may happen with variable blue giant stars as their expansions force gases from the denser inner regions of the core to the less dense photosphere by diffusion which would make them green untill the star ends this phase and contracts. this would repeat again and again. a star made mainly of nitrogen from a supernova explosion may form a star if there was enough gas to iniciate nitrogen fusion but it would have to be about 7 times as massive as the sun and nitrogen is not that common in the universe to form multiple green stars. a few shuld exist.