Exam 13: The Galaxies

Spiral galaxies are classified in terms of increasing tightness of their spiral arms as types Sa,Sb,and Sc.However,many spiral galaxies are aligned edge-on to Earth and their spiral arms cannot be seen.Which other parameter that is directly related to spiral arm tightness can be easily seen edge-on and can therefore be used to provide this classification?

(Multiple Choice)

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Question 141

The energy output of a bright quasar is equivalent to:

(Multiple Choice)

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Question 142

Which arrangement is CORRECLTY listed according to size,from largest to smallest?

(Multiple Choice)

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Question 143

What is the Hubble classification for a spiral galaxy with a small nuclear region and loosely wound arms?

(Multiple Choice)

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Question 144

Which phenomenon is NOT produced by collisions between galaxies?

(Multiple Choice)

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Question 145

We aim our radio telescope at a distant region of the Milky Way Galaxy and detect 21-cm radio waves with no Doppler shift.Which possible explanation is NOT correct?

(Multiple Choice)

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Question 146

The speed of the Sun in its orbit around the Milky Way Galaxy is deduced by reference to and observations of:

(Multiple Choice)

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Question 147

We have observed the central region of the Milky Way Galaxy in a number of wavelength ranges.With which one of the ranges is it MOST difficult to obtain information?

(Multiple Choice)

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Question 148

What is the Local Group?

(Multiple Choice)

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Question 149

What is an elliptical galaxy?

(Multiple Choice)

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Question 150

According to the Hubble classification scheme,an E4 galaxy has a(n):

(Multiple Choice)

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Question 151

What happens when the electron in a hydrogen atom flips its direction of spin from parallel to antiparallel to that of the proton?

(Multiple Choice)

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Question 152

Double-radio sources,quasars,and BL Lacertae objects are now considered to be the same basic type of object-an accretion disk producing two oppositely directed jets-but they appear to us to be very different because:

(Multiple Choice)

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Question 153

Which property is NOT characteristic of the center of the Milky Way Galaxy?

(Multiple Choice)

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Question 154

For gravitational lensing of a distant quasar to occur,the galaxy producing the lensing must:

(Multiple Choice)

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Question 155

What is a hypervelocity star?

(Multiple Choice)

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Question 156

The Hubble relation links which two characteristics of distant objects in the universe?

(Multiple Choice)

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Question 157

BL Lacertae objects appear to be:

(Multiple Choice)

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Question 158

How are the Magellanic Clouds,the two nearby satellite galaxies of the Milky Way Galaxy,classified?

(Multiple Choice)

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Question 159

The estimated distance from Earth to the Coma cluster of galaxies is about:

(Multiple Choice)

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Question 160

Showing 141 - 160 of 465

The energy output of a bright quasar is equivalent to:

Which arrangement is CORRECLTY listed according to size,from largest to smallest?

What is the Hubble classification for a spiral galaxy with a small nuclear region and loosely wound arms?

Which phenomenon is NOT produced by collisions between galaxies?

We aim our radio telescope at a distant region of the Milky Way Galaxy and detect 21-cm radio waves with no Doppler shift.Which possible explanation is NOT correct?

The speed of the Sun in its orbit around the Milky Way Galaxy is deduced by reference to and observations of:

We have observed the central region of the Milky Way Galaxy in a number of wavelength ranges.With which one of the ranges is it MOST difficult to obtain information?

What is the Local Group?

What is an elliptical galaxy?

According to the Hubble classification scheme,an E4 galaxy has a(n):

What happens when the electron in a hydrogen atom flips its direction of spin from parallel to antiparallel to that of the proton?

Double-radio sources,quasars,and BL Lacertae objects are now considered to be the same basic type of object-an accretion disk producing two oppositely directed jets-but they appear to us to be very different because:

Which property is NOT characteristic of the center of the Milky Way Galaxy?

For gravitational lensing of a distant quasar to occur,the galaxy producing the lensing must:

What is a hypervelocity star?

The Hubble relation links which two characteristics of distant objects in the universe?

BL Lacertae objects appear to be:

How are the Magellanic Clouds,the two nearby satellite galaxies of the Milky Way Galaxy,classified?

The estimated distance from Earth to the Coma cluster of galaxies is about:

Discovering the Night Sky

Gravitation and the Waltz of the Planets

Light and Telescopes

Formation of the Solar System and Other Planetary Systems

Exoplanets

The Terrestrial Planets and Their Moons

The Outer Planets and Their Moons

Vagabonds of the Solar System

The Sun: Our Extraordinary Ordinary Star

Characterizing Stars

The Lives of the Stars From Birth Through Middle Age

The Deaths and Remnants of Stars

Cosmology

Astrobiology

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