- 15.1: Why is it diffi cult to specify the dimensions of the disk and halo?
- 15.2: Why didnt astronomers before Shapley realize how large the galaxy is?
- 15.3: What evidence can you cite that our galaxy has a massive corona?
- 15.4: Explain why some star clusters lose stars more slowly than others.
- 15.5: Contrast the motion of the disk stars and that of the halo stars. W...
- 15.6: Why are metals less abundant in older stars than in younger stars?
- 15.7: Why do metal-poor stars have a wider range of orbital shapes than m...
- 15.8: What evidence contradicts the monolithic collapse hypothesis for th...
- 15.9: Why are all spiral tracers young?
- 15.10: Why couldnt spiral arms be physically connected structures? What wo...
- 15.11: What kind of galaxy would the spiral density wave produce if it act...
- 15.12: Why does self-sustaining star formation produce clouds of stars tha...
- 15.13: Describe the kinds of observations you would make to study the gala...
- 15.14: Why must astronomers use infrared telescopes to observe the motions...
- 15.15: What evidence can you cite that the nucleus of the galaxy contains ...
- 15.16: How Do We Know? Calibration simplifi es complex measurements, butho...
- 15.17: How Do We Know? The story of a process makes the facts easier to re...
Solutions for Chapter 15: The Milky Way Galaxy
Full solutions for Foundations of Astronomy | 11th Edition
Rain or snow with a pH value that is less than the pH of unpolluted precipitation.
The exchanges of energy and moisture that occur among the atmosphere, hydrosphere, solid Earth, biosphere, and cryosphere.
Cone of depression
A cone-shaped depression in the water table immediately surrounding a well.
Changes in rock caused by the heat from a nearby magma body.
The steep gradient that leads to the deep-ocean floor and marks the seaward edge of the continental shelf.
Melting that occurs as rock ascends due to a drop in confining pressure.
An organism whose genetic material is enclosed in a nucleus; plants, animals, and fungi are eukaryotes.
A sediment layer that is characterized by a decrease in sediment size from bottom to top.
An instrument designed to measure relative humidity.
The part of the mantle that extends from the core–mantle boundary to a depth of 660 kilometers.
The mass of water vapor in a unit mass of dry air; commonly expressed as grams of water vapor per kilogram of dry air.
A volcanic glass of felsic composition.
The amount of pressure change occurring over a given distance.
See Energy levels.
A chain of thermonuclear reactions by which nuclei of hydrogen are built up into nuclei of helium.
A fault in which the material above the fault plane moves up in relation to the material below.
Any weathering process that tends to produce a spherical shape from an initially blocky shape.
Not a continuous belt of high pressure but rather several semipermanent, anticyclonic centers characterized by subsidence and divergence located roughly between latitudes 25 and 35 degrees.
Two belts of winds that blow almost constantly from easterly directions and are located on the equatorward sides of the subtropical highs.
Tropical rain forest
A luxuriant broadleaf evergreen forest; also, the name given the climate associated with this vegetation.