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It is now established that the Milky Way is far more extended and of much greater mass than was hitherto thought. However, all that is visible of the constituents of the Milky Way’s corona (outer edge), where much of the galaxy’s mass must be located, is a tiny fraction of the corona’s mass. Thus most of the Milky Way’s outlying matter must be dark.

Why? Three facts are salient. First, dwarf galaxies and globular clusters, into which most of the stars of the Milky Way’s corona are probably bound, consist mainly of old stars. Second, old stars are not highly luminous. Third, no one has detected in the corona the clouds of gaseous matter such as hydrogen and carbon monoxide that are characteristic of the bright parts of a galaxy. 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.
The passage as a. whole is primarily concerned with
The corporation expects only _____ increases in sales next year despite a yearlong effort to revive its retailing business.
No computer system is immune to a virus, a particularly malicious program that is designed to(i)_____ and electronically(ii)_____ the disks on which data are stored.
Recent research indicates that a system of particles which has apparently decayed to randomness from (i)_____ state can be returned to that state; thus the system exhibits a kind of memory of its(ii)_____ condition.
A number of writers who once greatly (i)_____ the literary critic have recently recanted, substituting (ii)_____ for their former criticism.
She writes across generational lines, making the past so_____ that our belief that the present is the true locus of experience is undermined.
Individual freedom of thought should be(i)_____ more absolutely than individual freedom of action, given that the latter, though also desirable, must be(ii)_____ the limits imposed by the rights and freedom of others.
Their (i)_____ was expressed in quotidian behavior: they worshipped regularly,(ii)_____ all the regenerative processed of nature respect, and even awe.
My family often found others laughable, but I learned quite early to be _____ while people were present, laughing only later at what was funny and mocking what to us seemed.
The technical know-how, if not the political (i)_____, appears already at hand to feed the world's exploding population and so to(ii)_____ at last the ancient scourges of malnutrition and famine.
In small farming communities, accident victims rarely sue or demand compensation: transforming a personal injury into a(i)_____ someone else is viewed as an attempt to (ii)_____ responsibility for one's own actions.
Dominant interests often benefit most from _____ of governmental interference in business, since they are able to take care of themselves if left alone.
The "impostor syndrome" often afflicts those who fear that true self-disclosure will lower them in others' esteem; rightly handled, however, (i)_____ may actually (ii)_____ one's standing.
The pungent verbal give-and-take among the characters makes the novel (i)_____ reading, and this very (ii)_____ suggests to me that some of the opinions voiced may be the author's.
The fortresslike facade of the Museum of Cartoon Art seems calculated to remind visitors that the comic strip is an art form that has often been _____ by critics.
The fact that a theory is (i)_____ does not necessarily (ii)_____ its scientific truth, which must be established by unbiased controlled studies.
It is difficult to distinguish between the things that charismatic figures do _____ and those that are carefully contrived for effect.
The development of containers, possibly made from bark or the skins of animals, although this is a matter of _____, allowed the extensive sharing of forage foods in prehistoric human societies.
Although the young violinist's (i)_____ performance, with the orchestra demonstrated his technical competence. his uninspired style and lack of interpretive maturity labeled him as a novice musician rather than as a truly (ii)_____ performer.

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