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The core is made of hot, dense plasma (ions and electrons), at a pressure estimated at 26.5 million gigapascals (3.84 × 10 12 psi) at the center. [3] Due to fusion, the composition of the solar plasma drops from about 70% hydrogen by mass at the outer core, to 34% hydrogen at the center. [4]
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.
Solar core; Solar corona; Flare; ... the Sun's surface is covered by about 4 million granules. Below the photosphere is a layer of "supergranules" up to 30,000 ...
On December 24, Parker Solar Probe will come within 3.86 million miles (6.2 million kilometers) of the solar surface, closer than any human-made object to the sun.
Parker Solar Probe broke records as it made its burning-hot fly-by [NASA] ... (6.1 million km) from the solar surface. The probe plunged into our star's outer atmosphere on Christmas Eve, enduring ...
The surface abundance of Li on the Sun is 140 times less than the protosolar value (i.e. the primordial abundance at the Sun's birth), [18] yet the temperature at the base of the surface convective zone is not hot enough to burn – and hence deplete – Li. [19] This is known as the solar lithium problem.
This is the boundary of the Solar System to interstellar space. The outermost region of the Solar System is the theorized Oort cloud, the source for long-period comets, extending to a radius of 2,000–200,000 AU. The closest star to the Solar System, Proxima Centauri, is 4.25 light-years (269,000 AU) away.
NASA's Parker Solar Probe is about to make its closest approach to the sun. The spacecraft will fly within 3.8 million miles of the solar surface.