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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 core of the Sun is considered to extend from the center to about 0.2 of the solar radius (139,000 km; 86,000 mi). [1] It is the hottest part of the Sun and of the Solar System . It has a density of 150,000 kg/m 3 (150 g/cm 3 ) at the center, and a temperature of 15 million kelvins (15 million degrees Celsius; 27 million degrees Fahrenheit).
For example, with an axial tilt is 23°, and at a latitude of 45°, then the summer's peak sun angle is 68° (giving sin(68°) = 93% insolation at the surface), while winter's least sun angle is 22° (giving sin(22°) = 37% insolation at the surface). Thus, the greater the axial tilt, the stronger the seasons' variations at a given latitude.
It is sunlight that is Thomson-scattered by free electrons in the hot plasma of the Sun's outer atmosphere. The continuum nature of the spectrum arises from Doppler broadening of the Sun's Fraunhofer absorption lines in the reference frame of the (hot and therefore fast-moving) electrons. Although the K-corona is a phenomenon of the electrons ...
However, the scientific community doesn’t know why it happens or how it affects the reversal of the sun’s magnetic field. The sun is projected to reach its next solar maximum in 2024, so it ...
Folks enjoy a day at the beach while the warm weather and sun shines on Sandy Beach in Cohasset, Massachusetts, on Tuesday, October 22, 2024 ... Why it's still so hot and dry. Show comments ...
Similarly, hot showers can bring more blood to the skin, making it harder to reduce the inflammation, says board-certified dermatologist Blair Murphy-Rose, MD. Use an aloe vera-based product
Sunlight is the incandescence of the "white hot" surface of the Sun. Electromagnetic radiation from the sun has a peak wavelength of about 550 nm, [1] and can be harvested to generate heat or electricity. Thermal radiation can be concentrated on a tiny spot via reflecting mirrors, which concentrating solar power takes advantage of.