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In addition to conventional galaxies

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YellowSapphire Master | Next Rank: 500 Posts
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In addition to conventional galaxies

Post Wed Jul 28, 2010 5:05 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    In addition to conventional galaxies, the universe contains very dim galaxies that until recently went unnoticed by astronomers. Possibly as numerous as conventional galaxies, these galaxies have the same general shape and even the same approximate number of stars as a common type of conventional galaxy, the spiral, but tend to be much larger. Because these galaxies’ mass is spread out over larger areas, they have far fewer stars per unit volume than do conventional galaxies. Apparently these low-surface-brightness galaxies, as they are called, take much longer than conventional galaxies to condense their primordial gas and convert it to stars-that is, they evolve much more slowly.

    These galaxies may constitute an answer to the long-standing puzzle of the missing baryonic mass in the universe. Baryons-subatomic particles that are generally protons or neutrons-are the source of stellar, and therefore galactic, luminosity, and so their numbers can be estimated based on how luminous galaxies are. However, the amount of helium in the universe, as measured by spectroscopy, suggests that there are far more baryons in the universe than estimates based on galactic luminosity indicate. Astronomers have long speculated that the missing baryonic mass might eventually be discovered in intergalactic space or as some large population of galaxies that are difficult to detect.

    The primary purpose of the passage is to

    A: describe a phenomenon and consider its scientific significance
    B: contrast two phenomena and discuss a puzzling difference between them
    C: identify a newly discovered phenomenon and explain its origins
    D: compare two classes of objects and discuss the physical properties of each
    E: discuss a discovery and point out its inconsistency with existing theory

    Although I have understood partially about correct answer, I would like to understand about each option that why it is incorrect.

    A: ?
    B: "puzzling " is not discussed in broad view. It is just part of the passage.
    C: "identify a newly discovered phenomenon" discussed but ts origins not explained.
    D: ?
    E: ?

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    arora007 Community Manager
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    Post Wed Jul 28, 2010 7:53 am
    I thought the answer choice should be between C and E,

    but the answer being A...

    the verbal review explains it best!

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    paddle_sweep Master | Next Rank: 500 Posts Default Avatar
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    fiza gupta Master | Next Rank: 500 Posts
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    Post Sat Oct 15, 2016 6:57 am
    Author is describing about the new phenomena
    and then say "These galaxies may constitute an answer to the long-standing puzzle of the missing baryonic mass in the universe", how this new phenomena has helped to solve the puzzle

    The primary purpose of the passage is to

    A: describe a phenomenon and consider its scientific significance

    B: contrast two phenomena and discuss a puzzling difference between them
    Author in first paragraph do describe how new dim galaxies differ from conventional galaxies
    but ans is not describing about the second paragraph, new phenomena helped scientists

    C: identify a newly discovered phenomenon and explain its origins
    explain its origin, no where discussed

    D: compare two classes of objects and discuss the physical properties of each
    main idea of passage is not comparing but describing how new phenomena helped scientists

    E: discuss a discovery and point out its inconsistency with existing theory
    inconsistency - opposite[/b]

    So A

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