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.
No comments:
Post a Comment