a reply to: moeron60
The Sun is billions, trillions of nuclear furnaces all fired up at once, it emits
E-M radiation which is strongest where it is gushed out in Solar flares around
the magnetic filament loops which play along the surface. Little is known of
the core of the sun, just the outermost layers have been well studied.
The above infrared in frequency comes visible light. The Sun emits its peak power in the visible region, although integrating the entire emission
power spectrum through all wavelengths shows that the Sun emits slightly more infrared than visible light. By definition, visible light is the
part of the EM spectrum the human eye is the most sensitive to. Visible light (and near-infrared light) is typically absorbed and emitted by electrons
in molecules and atoms that move from one energy level to another. This action allows the chemical mechanisms that underlie human vision and plant
photosynthesis. The light that excites the human visual system is a very small portion of the electromagnetic spectrum. A rainbow shows the optical
(visible) part of the electromagnetic spectrum; infrared (if it could be seen) would be located just beyond the red side of the rainbow with
ultraviolet appearing just beyond the violet end.
Electromagnetic radiation with a wavelength between 380 nm and 760 nm (400–790 terahertz) is detected by the human eye and perceived as visible
light. Other wavelengths, especially near infrared (longer than 760 nm) and ultraviolet (shorter than 380 nm) are also sometimes referred to as light,
especially when the visibility to humans is not relevant. White light is a combination of lights of different wavelengths in the visible spectrum.
Passing white light through a prism splits it up into the several colors of light observed in the visible spectrum between 400 nm and 780 nm.
If radiation having a frequency in the visible region of the EM spectrum reflects off an object, say, a bowl of fruit, and then strikes the eyes, this
results in visual perception of the scene. The brain's visual system processes the multitude of reflected frequencies into different shades and hues,
and through this insufficiently-understood psychophysical phenomenon, most people perceive a bowl of fruit.
At most wavelengths, however, the information carried by electromagnetic radiation is not directly detected by human senses. Natural sources produce
EM radiation across the spectrum, and technology can also manipulate a broad range of wavelengths. Optical fiber transmits light that, although not
necessarily in the visible part of the spectrum (it is usually infrared), can carry information. The modulation is similar to that used with radio
edit on 15-9-2018 by ThatDidHappen because: (no reason given)