Source of light and heat

This crossword clue is for the definition: Source of light and heat.
it’s A 24 letters crossword puzzle definition.
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Possible Answers: SUN.

Last seen on: Irish Times Simplex – Oct 15 2020

Random information on the term “SUN”:

Sunlight is a portion of the electromagnetic radiation given off by the Sun, in particular infrared, visible, and ultraviolet light. On Earth, sunlight is scattered and filtered through Earth’s atmosphere, and is obvious as daylight when the Sun is above the horizon. When direct solar radiation is not blocked by clouds, it is experienced as sunshine, a combination of bright light and radiant heat. When blocked by clouds or reflected off other objects, sunlight is diffused. Sources indicate an “Average over the entire earth” of “164 Watts per square meter over a 24 hour day”.

The ultraviolet radiation in sunlight has both positive and negative health effects, as it is both a requisite for vitamin D3 synthesis and a mutagen.

Sunlight takes about 8.3 minutes to reach Earth from the surface of the Sun. A photon starting at the center of the Sun and changing direction every time it encounters a charged particle would take between 10,000 and 170,000 years to get to the surface.

SUN on Wikipedia