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Do all suns put out the same 'kind'of radiation?

Cooky

Veteran Member

There may be more to learn, but what we DO know already is that all suns put out electromagnetic radiation, so the correct answer to the OP is "yes." Regardless of what else they might put out, all suns do put out the same kind of radiation--namely electromagnetic.

Is it possible that another sun could produce colors outside of our suns color spectrum? Our sun appears white, but that's only because the colors: red, orange, yellow, green, blue, indigo and violet are combined together.

...But what about blue and red suns?
 

Polymath257

Think & Care
Staff member
Premium Member
Is it possible that another sun could produce colors outside of our suns color spectrum? Our sun appears white, but that's only because the colors: red, orange, yellow, green, blue, indigo and violet are combined together.

...But what about blue and red suns?

It isn't completely clear what you are asking. Blue stars will give off light at the shorter end of the spectrum: blue, violet, ultraviolet, while red stars will give off more in the long regions of the spectrum: orange, red, infrared.

Our eyes get washed out by intense light, so even reddish light will appear white if too bright.
 

wellwisher

Well-Known Member
The we heat a metal object the color will change as it gets hotter and hotter. We will go from red hot to white hot. This color is called black body radiation and it reflects the total radiative power per unit of surface area. Below is a diagram of color as a function of the black body surface temperature in degrees Kelvin. The average black body radiation of tour sun 5780K, which is yellowish white. If we heat something to 5780K it would have the color of the sun.

512px-Color_temperature_black_body_800-12200K.svg.png


Stars all use the same nuclear fusion reactions to build larger atoms giving off heat in the process. Depending on the strength and speed of these reactions determines the average radiative energy on the surface and the black body color.

Our sun at 5780K can feel very warm in a summer day. If its surface was 9000K you would not be able to go outside without wearing radiant protection. It would be like the sun getting much closer.

Note: A black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. Black-body radiation is the thermal electromagnetic radiation within or surrounding a body in thermodynamic equilibrium with its environment, or emitted by a black body(an opaque and non-reflective body).
 
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