The sun <u><em>appears</em></u> brighter than any other star.
(It isn't really, but it looks that way because it's much much much much much much closer to us than any other star.)
I would assume that the magnesium would have to come into contact with an ion in order to become a magnesium ion.
Answer:
I think it's 2 the photo is hard to tell what they are exactly talking about.
