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Wien in 1911
Wien in 1911
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Blacksmiths work iron when it is hot enough to emit plainly visible thermal radiation.
Blacksmiths work iron when it is hot enough to emit plainly visible thermal radiation.
The color of a star is determined by its temperature, according to Wien's law. In the constellation of Orion, one can compare Betelgeuse (T ≈ 3300 K,
The color of a star is determined by its temperature, according to Wien's law. In the constellation of Orion, one can compare Betelgeuse (T ≈ 3300 K, upper left), Rigel (T = 12100 K, bottom right), Bellatrix (T = 22000 K, upper right), and Mintaka (T = 31800 K, rightmost of the 3 "belt stars" in the middle).