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[–] carlip 2 points 1 points (+3|-2) ago 

It should be noted that a wavelength is not measured in degrees.

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[–] KillerMech 0 points 7 points (+7|-0) ago 

They are saying the wavelength that the light is seen in is ultraviolet, that the ionized iron particles are 2.8 million degrees Celsius.

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[–] carlip 1 points -1 points (+0|-1) ago 

Ok that makes sense, except for iron particles. The sun is not fusing anything into iron yet.

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[–] aeschynanthus 0 points 2 points (+2|-0) ago 

As KillerMech said, there's an embedded clause ("observed in this extreme ultraviolet wavelength of light") inside "The temperature of the ionized iron particles ... was about 2.8 million degrees C".