it turns out fat is not what you should avoid

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observed the sunspot spectrum in the early 20th century with his new solar telescope and found it similar to that of cool red M-type stars observed with his new stellar telescope. Thus, he showed that the umbra appears dark because it is quite cool, only about 3,000 K, as compared with the 5,800 K temperature of the surrounding photosphere. The spot pressure, consisting of magnetic and gas pressure, must balance the pressure of its surroundings; hence the spot must somehow cool until the inside gas pressure is considerably lower than that of the outside.

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