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Spectral violet is shorter in wavelength than blue is, clocking in at just 380 to 435 nanometers, whereas purple is how we see an interplay of red and blue and violet wavelengths. Short answer: most stars emit a very wide range of wavelengths, from MHz (radio) to gamma ray, 1019Hz 10 19 H z -- albeit rather little of the latter.
1. Our eyes and brains make them blue. Stars are (close to) a black body, they emit a broad band of radiation. The hottest stars will emit most of their radiation in the ultraviolet but they will still be very bright in visible light. As they get hotter, they emit even more ultraviolet, and more visible light but the mixture of wavelengths in ...
Obviously, they can exist. There are blue stars: There are red stars (red giants): If these happen to circle one another you will perceive the entire system as violet (from Earth). One of two stars can develop into a red giant while the other stays a hot blue one.
As one varies the temperature, the color of a star should make a one-dimensional curve in this color space. Thus, unless some perverse shenanigans are going on, it is intuitive that we necessarily miss most of colors, i.e. there will be no stars of those colors. Our Sun actually has a peak at about 500nm 500 n m, which is a green.
There are two sets of binary pairs that are almost exactly along the same line of sight such that the light from the four stars together co-mingles and from Earth looks like a single star. Interestingly, the different stars have different colors, meaning that as you stare at it, it can appear white, red, or blue, just as you described.
To not emit much in the visible part of the spectrum, a star has to be very cold indeed, at most a few 100K, when radiation is mostly in the infrared (which is still detectable). By definition, a star is an object that undergoes (or has undergone) hydrogen burning (H → → He fusion). This sets an lower mass limit of 0.08M ⊙ ⊙.
The Sun looks yellow from Earth because we see it through the atmosphere; in space the Sun looks rather white. Do A-, B- and O-type stars look blue from both their planet's atmospheres and outer space? Do red dwarfs look reddish even if you look at them from space (I mean close to them, in their own planetary system)?
Stars looking red have almost no green or blue light in their spectrum, hence all objects in this kind of light look either red or black. Whitish stars provide all colors. Bluish stars also, but red-toned objects look darker and more yellowish than in white light; most colors are shifted a bit towards blue. – Gerald.
Aug 9, 2017 at 14:30. The "cluster of gas" is from gas, not countless stars (not to mention the fact that astronomers have counted the stars and wind up with 100-400 billion stars in our Milky Way and ~5000 visible by the naked eye from Earth). Most of that gas is obscuring dust from the interstellar medium. – zephyr.
The "stars" of Jupiter was a huge motivation for Galileo as he correctly predicted that these 4 bodies were not the only stars but the twinkling objects in the sky were stars and not just heavenly bodies. He confirmed that the Milky Way consists of multitude of stars packed so densely that they appeared from Earth to be clouds (due to ...