Sun FAQs:

Q: Is Sun the star at the center of the Solar System?

A: Yes.

Q: Is Sun a gradually cooling liquid body that is radiating an internal store of heat?

A: Yes.

Q: Is Sun actually emitting more photons in the green portion of the spectrum than any other?

A: Yes.

Q: Is Sun contained within the Local Bubble?

A: Yes, and a space of rarefied hot gas, possibly produced by the supernova remnant Geminga, or multiple supernovae in subgroup B1 of the Pleiades moving group.

Q: Is Sun the center around which the planets orbit was first proposed by the ancient Greek Aristarchus of Samos in the 3rd century BC, and later adopted by Seleucus of Seleucia?

A: Yes, This view was developed in a more detailed mathematical model of a heliocentric system in the 16th century by Nicolaus Copernicus.

Q: Is Sun high in the sky?

A: Yes.

Q: Is Sun a temperature minimum region extending to about 500 km above the photosphere, and has a temperature of about 4,100 K?

A: Yes, This part of the Sun is cool enough to allow the existence of simple molecules such as carbon monoxide and water, which can be detected via their absorption spectra.

Q: Is Sun produced by Big Bang nucleosynthesis?

A: Yes, and the heavier elements were produced by stellar nucleosynthesis in generations of stars that completed their stellar evolution and returned their material to the interstellar medium before the formation of the Sun.

Q: Was Sun thought to be a solar deity or other supernatural entity?

A: Yes.

Q: Is Sun a process that involves photons in thermodynamic equilibrium with matter?

A: Yes, and the time scale of energy transport in the Sun is longer, on the order of 30,000,000 years.

Q: Was Sun born?

A: Yes.

Q: Was Sun personified as the goddess *Seh2ul?

A: Yes.

Q: Is Sun composed primarily of the chemical elements hydrogen and helium?

A: Yes, they account for 74.

Q: Is Sun covered by that of the Moon?

A: Yes, and parts of the Sun's surrounding atmosphere can be seen.

Q: Is Sun still considered a god?

A: Yes.

Q: Was Sun worshipped as the god Ra?

A: Yes, and portrayed as a falcon-headed divinity surmounted by the solar disk, and surrounded by a serpent.

Q: Is Sun a G2V star?

A: Yes, and with G2 indicating its surface temperature of approximately 5,778 K , and V that it, like most stars, is a main-sequence star.

Q: Is Sun about halfway through its main-sequence stage?

A: Yes, and during which nuclear fusion reactions in its core fuse hydrogen into helium.

Q: Was Sun the Greek philosopher Anaxagoras?

A: Yes.

Q: Was Sun a source of life?

A: Yes, and giving warmth and illumination to mankind.

Q: Is Sun a Population I?

A: Yes, or heavy-element-rich, star.

Q: Is Sun defined to begin at the distance where the flow of the solar wind becomes superalfvénic—that is, where the flow becomes faster than the speed of Alfvén waves, at approximately 20 solar radii?

A: Yes, Turbulence and dynamic forces in the heliosphere cannot affect the shape of the solar corona within, because the information can only travel at the speed of Alfvén waves.

Q: Is Sun intense and well focused?

A: Yes, conditions are worsened by young eyes or new lens implants , Sun angles near the zenith, and observing locations at high altitude.

Q: Was Sun only about 75% as bright as it is today?

A: Yes.

Q: Is Sun gradually becoming hotter during its time on the main sequence?

A: Yes, because the helium atoms in the core occupy less volume than the hydrogen atoms that were fused.

Q: Was Sun Utu?

A: Yes, and the god of justice and twin brother of Inanna, the Queen of Heaven, who was identified as the planet Venus.

Q: Is Sun heated by this energy as it is transferred outwards through many successive layers?

A: Yes, and finally to the solar photosphere where it escapes into space as sunlight or the kinetic energy of particles.

Q: Is Sun about 1.88 giga candela per square metre?

A: Yes, but as viewed through Earth's atmosphere, this is lowered to about 1.44 Gcd/m2.

Q: Is Sun a G-type main-sequence star based on its spectral class?

A: Yes.

Q: Is Sun low in the sky?

A: Yes, and atmospheric scattering renders the Sun yellow, red, orange, or magenta.

Q: Is Sun lower than theories predicted by a factor of 3?

A: Yes, This discrepancy was resolved in 2001 through the discovery of the effects of neutrino oscillation: the Sun emits the number of neutrinos predicted by the theory, but neutrino detectors were missing ​2⁄3 of them because the neutrinos had changed flavor by the time they were detected.

Q: Is Sun roughly middle-aged?

A: Yes, it has not changed dramatically for more than four billion years, and will remain fairly stable for more than another five billion years.

Q: Is Sun as the luminous disk in the sky?

A: Yes, and whose presence above the horizon creates day and whose absence causes night.

Q: Is Sun sometimes faint enough to be viewed comfortably with the naked eye or safely with optics?

A: Yes, Hazy conditions, atmospheric dust, and high humidity contribute to this atmospheric attenuation.

Q: Is Sun alternately burning hydrogen in a shell or helium in a deeper shell?

A: Yes.

Q: Is Sun a near-perfect sphere with an oblateness estimated at about 9 millionths, which means that its polar diameter differs from its equatorial diameter by only 10 kilometres?

A: Yes, The tidal effect of the planets is weak and does not significantly affect the shape of the Sun.

Q: Is Sun near the zenith?

A: Yes.

Q: Is Sun more poorly understood?

A: Yes.

Q: Is Sun NASA's Pioneers 5?

A: Yes, and 6, 7, 8 and 9, which were launched between 1959 and 1968.

Q: Is Sun by far the brightest object in the Earth's sky?

A: Yes, and with an apparent magnitude of −26.

Q: Is Sun the basis of solar calendars?

A: Yes, and one of which is the predominant calendar in use today.

Q: Was Sun central to civilizations such as the ancient Egyptians?

A: Yes, and the Inca of South America and the Aztecs of what is now Mexico.

Q: Was Sun confirmed in 1925 by Cecilia Payne using the ionization theory developed by Meghnad Saha?

A: Yes, and an Indian physicist.

Q: Is Sun a G-type main-sequence star that comprises about 99?

A: Yes.

Q: Is Sun now roughly 60% helium?

A: Yes, and with the abundance of heavier elements unchanged.