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6 hours ago · The sun likes to remind us that Earth is merely one part of a joined system.It has ultraviolet rays that can burn our skin and eyes and even drive extinction.Its light can disappear altogether ...
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.
1 day ago · The data quality of the UCoMP observations was sufficient for us to derive maps of plasma density, wave propagation direction, and phase speed in the global corona for 114 days during the 253-day (~8-month) period of 19 February to 29 October 2022. Most data gaps are attributable to bad weather conditions.
5 days ago · When the sun is high overhead, its rays pass through the intervening atmosphere almost vertically. The light thus encounters less dust and fewer air molecules than it would if the sun were low on the horizon and its rays had a longer passage through the atmosphere.
- The Editors of Encyclopaedia Britannica
1 day ago · NASA’s Parker Solar Probe completed its 21st close approach to the Sun on Sept. 30, equaling its own distance record by coming within about 4.51 million miles (7.26 million kilometers) of the solar surface. The close approach (known as perihelion) occurred at 5:15 UTC — or 12:15 a.m. EDT — with Parker Solar Probe moving 394,700 miles per ...
4 days ago · Andreas Cellarius 's illustration of the Copernican system, from the Harmonia Macrocosmica. Heliocentrism[a] (also known as the heliocentric model) is a superseded astronomical model in which the Earth and planets revolve around the Sun at the center of the universe. Historically, heliocentrism was opposed to geocentrism, which placed the Earth ...
1 day ago · During the UCoMP study, the research team produced 114 magnetic field maps between February and October 2022, or one almost every other day. "We are entering a new era of solar physics research ...
