Astronomy a beginners guide to the universe 8th CHaisson mcmillan chapter 16 clicker questions

TO THE UNIVERSEEIGHTH EDITION CHAPTER 16 Galaxies and Dark Matter Clickers... Based on galactic rotation curves and motions in clusters of galaxies, dark mattera makes up about 90 percen

TO THE UNIVERSE

EIGHTH EDITION

CHAPTER 16

Galaxies and Dark Matter

Clickers

Based on galactic rotation curves and motions in clusters of galaxies, dark matter

a) makes up about 90 percent of the

matter in the universe

b) is best detected by the largest optical

telescopes

c) makes up about 10 percent of the

matter in clusters of galaxies

d) exists but has no observable effects

on galaxies

e) is the result of gas and dust

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Based on galactic rotation curves and motions in clusters of galaxies, dark matter

matter in the universe.

b) is best detected by the largest optical

telescopes

c) makes up about 10 percent of the

matter in clusters of galaxies

d) exists but has no observable effects

on galaxies

e) is the result of gas and dust

Collisions between galaxies

a) are much rarer than collisions between stars

b) can transform elliptical galaxies into spirals

c) trigger Type II supernova explosions in the halo

d) cause gas and dust clouds to collide, leading to rapid star formation

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Collisions between galaxies

a) are much rarer than collisions between stars

b) can transform elliptical galaxies into spirals

c) trigger Type II supernova explosions in the halo

rapid star formation.

Explanation: Galaxies are

relatively close compared

with their size In clusters of

galaxies, collisions clearly

occur

When spiral galaxies collide, the greatest impact occurs

on their

a) globular cluster stars

b) giant molecular clouds

c) central bulge stars

d) open clusters

e) disk stars

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When spiral galaxies collide, the greatest impact occurs

on their

a) globular cluster stars

c) central bulge stars

d) open clusters

e) disk stars

Due to the density and collisions among galaxies, _ are rare in the centers of clusters.

a) giant ellipticals

b) irregulars

c) spirals

d) active galaxies

e) radio galaxies

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Due to the density and collisions among galaxies, _ are rare in the centers of clusters.

a) giant ellipticals

b) irregulars

d) active galaxies

e) radio galaxies

Explanation: The gas, dust, and disks of spiral galaxies

are tidally disrupted, and even destroyed, in the centers of dense clusters, which are often dominated by giant elliptical galaxies

The rapid variation of brightness of quasars indicates

a) the source of energy is very small

b) energy is coming from matter and antimatter

c) the energy source is rotating rapidly

d) a chain reaction of supernovas occurs

e) there are many separate sources of energy in the core

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The rapid variation of brightness of quasars indicates

b) energy is coming from matter and antimatter

c) the energy source is rotating rapidly

d) a chain reaction of supernovas occurs

e) there are many separate sources of energy in the core

Explanation: The size of

an object cannot be

larger than the distance

light can travel in the

time it takes to change

its brightness

A galaxy seen 1 billion light-years away means we see it as it

a) was when the universe was 1 billion years old

b) will be 1 billion years from now

c) was 1 billion years ago

d) is today, but redshifted 10 percent of the speed of light

e) was just after the Big Bang

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A galaxy seen 1 billion light-years away means we see it as it

a) was when the universe was 1 billion years old

b) will be 1 billion years from now

d) is today, but redshifted 10

percent of the speed of light

e) was just after the Big Bang

Explanation: Looking farther away

in space means looking back further

in time, to when the object (and

universe) was younger

The large-scale distribution of galaxies in the universe reveals

a) a smooth, continuous, and homogeneous

arrangement of clusters

b) large voids, with most of the galaxies lying in

filaments and sheets

c) a large supercluster at the center of the universe

d) a central void with walls of galaxies at the edge of

the universe

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The large-scale distribution of galaxies in the universe reveals

a) a smooth, continuous, and homogeneous

arrangement of clusters

of the galaxies lying in filaments and sheets.

c) a large supercluster at

the center of the universe

d) a central void with walls of

galaxies at the edge of the universe

The lensing of a distant quasar is produced in a foreground galaxy by its

a) total mass of stars, gas, and dark matter

b) central supermassive black hole

c) globular clusters

d) magnetic fields

e) intergalactic gas

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The lensing of a distant quasar is produced in a foreground galaxy by its

b) central supermassive black hole

c) globular clusters

d) magnetic fields

e) intergalactic gas

Explanation: The twin quasar

AC114 has two images of the

same object

The blue arcs in this image are

a) emission nebulae

b) nearby blue dwarf galaxies

c) blue supergiant stars

d) a very distant galaxy imaged

by a massive galaxy cluster between us and the distant galaxy

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The blue arcs in this image are

a) emission nebulae

b) nearby blue dwarf galaxies

c) blue supergiant stars

by a massive galaxy cluster between us and the distant galaxy.

Explanation: The nearby galaxy—yellow blobs in the center of this image—is 1.5 billion pc from us The blue arcs are all images of a single, much more distant galaxy