bidskamikaze wrote:
4. The passage presents which of the following as incontrovertible?
I.The low luminosity of old stars
II.The absence of clouds of gaseous matter from the corona of the Milky Way
III.The predominance of globular clusters and dwarf galaxies in the corona of the Milky Way
(A) I only
(B) III only
(C) I and II only
(D) II and III only
(E) I, II, and III
Could anyone explain question 4 above?
"I.The low luminosity of old stars" - In the passage it is stated:
"Second, old stars are not highly luminous."Can we infer from this that old stars have low luminosity?
I am not sure, but it could be that old stars may also have moderate luminosity.
Hi
bidskamikaze,
You are right in your inference, even the author doubts the conclusion: " At present, therefore,
the best explanation—though still quite tentative—for the darkness of the corona is that the corona is composed mainly of old, burned-out stars.",
so we can't really say I also completely incontrovertible, but looking at the other options mentioned in the question, I would be the closest, as the other two can be clearly eliminated.
Hope This Helps.
Thanks.