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2 days ago · 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.
3 days ago · Solar Orbiter observes an active region on the Sun. The Sun seen by Solar Orbiter on 3 March 2022, during the spacecraft's first close approach to the Sun. This view was part of an important piece of research that opens up a new way for solar physicists to study the source regions of the solar wind. The main, largest image was taken with the ...
1 day ago · The sun produced an X2.9 flare at 7:08 UTC on May 27. An incoming active region on the southeast limb (edge) – still behind the solar horizon – was the flare’s source.
5 days ago · The Sun is so far from Earth that this slightly fuzzy surface cannot be resolved, and so the limb (the visible edge) appears sharp. The mass of the Sun, M ☉, is 743 times the total mass of all the planets in the solar system and 330,000 times that of Earth.
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5 days ago · Solar radiation occurs at all wavelengths listed below. From the photosphere, at a temperature of 6000 K, both infrared and visible radiation are emitted. High in the Sun's atmosphere, the temperature increases, and UV and X- rays are emitted. Some of the radiation is thermal (broadband) and some is line (spectral) radiation.
2 days ago · UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun. It is also produced by electric arcs, Cherenkov radiation, and specialized lights, such as mercury-vapor lamps, tanning lamps, and black lights .
5 days ago · The sun ’ s rays also damage our eyes. Exposure can cause cataracts as well as damage to part of the retina, cornea and lens. Cheryl Khanna, M.D. of Mayo Clinic, recommends wearing sunglasses that block 99 to 100 percent of UVA and UVB rays. Keep in mind that some sunglass designs offer better protection than others.
