[LibWhacker]

Seriously how do they KNOW its multitrillion degrees?

From the article:

Scientists measure the temperature of hot matter by looking at the color, or energy distribution, of light emitted from it — similar to the way one can tell that an iron rod is hot by looking at its glow.

[Adder]

I read that.

But I don’t know how hot an iron rod is by looking at it. There is an whole range of “white hot” for example.