21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 19, Problem 22QP
To determine
To explain how elliptical galaxies and spiral bulges are similar.
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O Galaxies take different shapes depending on how the stars are distributed and oriented.
O Agreat island of stars held together by gravity.
All galaxies are basically of the same shape and consist mainly of a discs and a halos.
All the stars in a galary orbit a common center
Chapter 19 Solutions
21st Century Astronomy
Ch. 19.1 - Prob. 19.1ACYUCh. 19.1 - Prob. 19.1BCYUCh. 19.2 - Prob. 19.2CYUCh. 19.3 - Prob. 19.3CYUCh. 19.4 - Prob. 19.4CYUCh. 19 - Prob. 1QPCh. 19 - Prob. 2QPCh. 19 - Prob. 3QPCh. 19 - Prob. 4QPCh. 19 - Prob. 5QP
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- What are the two best ways to measure the distance to a nearby spiral galaxy, and how would it be measured?arrow_forwardDescribe how you might use the color of a galaxy to determine something about what kinds of stars it contains.arrow_forwardExplain where in a spiral galaxy you would expect to find globular clusters, molecular clouds, and atomic hydrogen.arrow_forward
- Does an elliptical galaxy rotate like a spiral galaxy? Explain.arrow_forwardDescribe the evolution of an elliptical galaxy. How does the evolution of a spiral galaxy differ from that of an elliptical?arrow_forwardWhen comparing two isolated spiral galaxies that have the same apparent brightness, but rotate at different rates, what can you say about their relative luminosity?arrow_forward
- Assume that the Sun orbits the center of the Galaxy at a speed of 220 km/s and a distance of 26,000 lightyears from the center. A. Calculate the circumference of the Sun’s orbit, assuming it to be approximately circular. (Remember that the circumference of a circle is given by 2pR, where R is the radius of the circle. Be sure to use consistent units. The conversion from light-years to km/s can be found in an online calculator or appendix, or you can calculate it for yourself: the speed of light is 300,000 km/s, and you can determine the number of seconds in a year.) B. Calculate the Sun’s period, the “galactic year.” Again, be careful with the units. Does it agree with the number we gave above?arrow_forwardWhat are the two best ways to measure the distance to a distant, isolated spiral galaxy, and how would it be measured?arrow_forwardWhich one of these types of galaxies do you expect to have the largest star formation activity? Select one: ○ a. E7 ○ b. Sc ○ c. Sa ○ d. Sbarrow_forward
- Explain why galaxies can have different shapes. please explain briefly and clearlyarrow_forwardWhat are the three main types of galaxies, and what are the peculiarities? What type is the Milky Way?arrow_forwardWhat type of galaxy does this picture represent? O Elliptical O Irregular O Spiralarrow_forward
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