Understanding Our Universe
Understanding Our Universe
3rd Edition
ISBN: 9780393614428
Author: PALEN, Stacy, Kay, Laura, Blumenthal, George (george Ray)
Publisher: W.w. Norton & Company,
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Chapter 17, Problem 20QAP
To determine

Formation of giant elliptical galaxies.

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Which of the following statements about the different types (shapes) of galaxies are correct?  (choose all that apply) whatever type a galaxy is at its birth, that’s what it will be for all time   what type we see a galaxy to be just depends on the angle at which we happen to see it; all galaxies look roughly the same in shape   all galaxies start out as ellipticals, but some later evolve to be spirals and irregulars   collisions and mergers between galaxies can sometimes change a galaxy’s type (shape)
What kinds of objects lie in the halo of a spiral galaxy? Globular clusters O and B stars Open clusters All typical components of a spiral galaxy (gas, dust, star clusters, O and B stars) Gas and dust
An astronomer in an imaginary Universe observes a small patch of the sky (0.005% of the total) with very deep observations and finds one million galaxies. How many galaxies can they estimate to be present in the whole Universe? 10 billion 20 billion 50 billion O 70 billion
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