UNDERSTANDING THE UNIVERSE(LL)-W/CODE
3rd Edition
ISBN: 9780393869903
Author: PALEN
Publisher: NORTON
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Question
Chapter 15, Problem 3QAP
To determine
The presence of dark matter in Milky Way.
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In which portion of the spectrum is the core of the galaxy invisible?
a.
infrared
b.
visible
c.
gamma ray
d.
X ray
e.
radio
The lower limit of the mass of the galaxy is
a.
100 solar masses.
b.
100,000 solar masses.
c.
100 million solar masses.
d.
100 billion solar masses.
e.
100 trillion solar masses.
Disk population stars have
I. circular orbits in the plane of the galaxy
II. randomly tipped, elliptical orbits
III. old stars with low metal content
IV. young stars with heavy metal content
a.
I and II
b.
I and III
c.
II and III
d.
II and IV
e.
I and IV
Chapter 15 Solutions
UNDERSTANDING THE UNIVERSE(LL)-W/CODE
Ch. 15.1 - Prob. 15.1CYUCh. 15.2 - Prob. 15.2CYUCh. 15.3 - Prob. 15.3CYUCh. 15.4 - Prob. 15.4CYUCh. 15 - Prob. 1QAPCh. 15 - Prob. 2QAPCh. 15 - Prob. 3QAPCh. 15 - Prob. 4QAPCh. 15 - Prob. 5QAPCh. 15 - Prob. 6QAP
Ch. 15 - Prob. 7QAPCh. 15 - Prob. 8QAPCh. 15 - Prob. 9QAPCh. 15 - Prob. 10QAPCh. 15 - Prob. 11QAPCh. 15 - Prob. 12QAPCh. 15 - Prob. 13QAPCh. 15 - Prob. 14QAPCh. 15 - Prob. 15QAPCh. 15 - Prob. 16QAPCh. 15 - Prob. 17QAPCh. 15 - Prob. 18QAPCh. 15 - Prob. 19QAPCh. 15 - Prob. 20QAPCh. 15 - Prob. 21QAPCh. 15 - Prob. 22QAPCh. 15 - Prob. 23QAPCh. 15 - Prob. 24QAPCh. 15 - Prob. 25QAPCh. 15 - Prob. 26QAPCh. 15 - Prob. 27QAPCh. 15 - Prob. 28QAPCh. 15 - Prob. 29QAPCh. 15 - Prob. 30QAPCh. 15 - Prob. 31QAPCh. 15 - Prob. 32QAPCh. 15 - Prob. 33QAPCh. 15 - Prob. 34QAPCh. 15 - Prob. 35QAPCh. 15 - Prob. 36QAPCh. 15 - Prob. 37QAPCh. 15 - Prob. 38QAPCh. 15 - Prob. 39QAPCh. 15 - Prob. 40QAPCh. 15 - Prob. 41QAPCh. 15 - Prob. 42QAPCh. 15 - Prob. 43QAPCh. 15 - Prob. 44QAPCh. 15 - Prob. 45QAP
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- What will be the long-term future of our Galaxy?arrow_forwardExplain why we see the Milky Way as a faint band of light stretching across the sky.arrow_forwardThe dwarf galaxy in Sagittarius is the one closest to the Milky Way, yet it was discovered only in 1994. Can you think of a reason it was not discovered earlier? (Hint: Think about what else is in its constellation.)arrow_forward
- What evidence contradicts the top-down hypothesis for the origin of our Galaxy?arrow_forwardWhy did it take so long for the existence of other galaxies to be established?arrow_forwardMost distances in the Galaxy are measured in light-years instead of meters. Why do you think this is the case?arrow_forward
- The nearest galaxy to our home galaxy is about 2.5 million light- years away. How many meters is that?arrow_forwardThe orbits of population I stars I. are confined to disk of the galaxy. II. are very elliptical. III. are nearly circular. IV. are randomly inclined to the disk of the galaxy. a. I b. IV c. I & IV d. II & IV e. I & IIIarrow_forwardThe large black hole at the center of our galaxy is estimated to be a. 3.7 solar masses. b. 3.7 thousand solar masses. c. 3.7 million solar masses. d. 3.7 billion solar masses. e. 3.7 trillion solar masses.arrow_forward
- If the sun is 4.6 billion years old, how many times has it orbited the Milky Way? (The sun is 8,300 pc from the cemetery of the Milky Way, and orbits the center at a speed of 225 km/s.) ______ timesarrow_forwardWhat is milky way ? Write just 1 paragraph.arrow_forwardAccording to the Hubble law, if Galaxy A is 10 times more distant than Galaxy B, then Galaxy A is a. receding 10 times faster than Galaxy B. b. approaching 10 times faster than Galaxy B. c. receding 100 times faster than Galaxy B. d. approaching 100 times faster than Galaxy B.arrow_forward
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