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The Sun is the star at the center of the Solar System.It is a massive, nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light and infrared radiation with 10% at ultraviolet energies.
The existence of nearly all life on Earth is fueled by light from the Sun. Most autotrophs, such as plants, use the energy of sunlight, combined with carbon dioxide and water, to produce simple sugars—a process known as photosynthesis. These sugars are then used as building-blocks and in other synthetic pathways that allow the organism to grow.
I thought, light is a beautiful word. There's all kinds of light–there's sunlight, there's flashlight, there's strobe lights, there's night lights, there's streetlights...all of the lights. When I said that, a literal light went off in my brain, I was like [singing] "All of the lights, all of the lights". I had it.
The sun may be nowhere in sight when the dazzling celestial display, also known as the aurora borealis, is lighting up the night sky, but it has a crucial part to play in producing the auroras.
At this average distance, light travels from the Sun to Earth in about 8 minutes, 19 seconds. The energy of this sunlight supports almost all life [b] on Earth by photosynthesis, [13] and drives Earth's climate and weather. [14] As recent as the 19th century, scientists had little knowledge of the Sun's physical composition and source of energy.
Astronomers have spotted a stunning aurora-like display tens of thousands of miles above a dark and cold patch on the Sun. The new type of radio emissions share properties with the northern lights ...
The Fraunhofer lines are typical spectral absorption lines. Absorption lines are narrow regions of decreased intensity in a spectrum, which are the result of photons being absorbed as light passes from the source to the detector. In the Sun, Fraunhofer lines are a result of gas in the Sun's atmosphere and outer photosphere. These regions have ...
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. [15] By definition, visible light is the part of the EM spectrum the human eye is the most ...