A Couple Of Question To Start The Day,

how hot is the sun?

image credit: Hinode JAXA/ NASA/ Wikimedia Commons, according to this article the hottest part of our Sun is its core, where nuclear fusion reactions create temperatures up to 15 million degrees Celsius (ºC) or 27 million degrees Fahrenheit (ºF), according to NASA, on to the next question, how do we know having never been there? apparently the answer is seismology, the study of earthquakes, starting with the development of the seismograph, which allowed us to record ground oscillations. With the power of science and mathematics, these oscillations became the key to mapping our planet's interior, fast forward to the 1960s, the decade of powerful telescopes, scientists realized that the Sun oscillated, too, this gave them the revelation that the methods of seismology might also apply to our Sun. This gave birth to helioseismology. And if seismology applies to our Sun, then it would also work for other stars out there, this realization gave rise to asteroseismology, for myself it is amazing how discoveries build one upon the other, as it happens our Sun is by no means the hottest star, that accolade goes to the star WR 102, which is found in the constellation of Sagittarius and has a surface temperature of over 200,000ºC. the brightest of stars in our night sky, Sirius, has a surface temperature of 9,600ºC, while Alpha Centauri A, the Earth’s nearest yellow dwarf star (like that of our Sun) is 5,500ºC at its surface, for the full story have a look here.