00:01
Now, hearing this question, we ask the foreign question, which parts of the spectrum, electron minus spectrum, should presence of elements in the star's atmosphere? well, you know, if you look at the star, you look at your measure spectrum, you know, the outline, roughly, it's always like a blackboard spectrum, like going like this, it's blackboard spectrum going like this, okay? but if you look carefully, you find some missing lines, some missing lines like this, and certain frequencies, and a certain wavelengths, the lines are just darker or even missing.
00:37
And the reason is because those lines are sometimes called absorption lines, and those lines exist because in the star, there are some elements which actually absorb as the light path through the atmosphere.
00:52
The lines, i mean, the elements are a bit cooler cooler than the inner part of the atmosphere...