Question 1

Low mass stars like the Sun transport energy near their surface using convection.

Accepted Answer

A) True 
 B)False  True

Question 2

Star clusters are important to the study the stellar evolution because stars in a given cluster have the same _____________.

Accepted Answer

age

Question 3

Whatis a protostar and how does it get its energy?

Accepted Answer

A protostar can be defined as a forming star that is compressed enough to be opaque at all wavelengths but not so hot and compressed as to be able to generate energy by nuclear fusion, as would a main-sequence star. 
A protostar shines with energy released gravitationally, from a combination of matter falling inward to the protostar, plus slow contraction of the protostar itself.

Question 4

The nuclear reactions in a star's core burn steadily so long as the relationship between _____________ and_____________ is stable.

Accepted Answer

pressure;

Question 5

Theforce responsible for the collapse of an interstellar cloud is_____________.

Accepted Answer

The answer of Theforce responsible for the collapse of an...

Question 6

Eighty percent of the stars on the H-R Diagram are on the main sequence, and that is because the star is in hydrostatic equilibrium due to the _____.

Accepted Answer

A)  degenerate property of hydrogen 
B)  degenerate property of helium 
C)  Hertzsprung-Russell Principle 
D)  fusion of hydrogen 
E)  fusion of helium 
A)  degenerate property of hydrogen 
B)  degenerate property of helium 
C)  Hertzsprung-Russell Principle 
D)  fusion of hydrogen 
E)  fusion of helium

Question 7

What istheresistanceofagastotheflowofradiation?

Accepted Answer

A)  degeneracy 
B)  conduction 
C)  opacity 
D)  hydrostatic pressure 
E)  gravitational pressure 
A)  degeneracy 
B)  conduction 
C)  opacity 
D)  hydrostatic pressure 
E)  gravitational pressure

Question 8

What is the difference between the proton-proton chain and the CNO cycle?

Accepted Answer

Both fusion processes convert H into He.

Question 9

Before a giant molecular cloud can contract gravitationally, it must overcome four physical factors that resist compression.  What are these four factors?

Accepted Answer

1 The thermal energy of the ga

Question 10

When a large gas cloud starts to collapse in a free-fall due to gravity, it will start to cool down as it contracts because of the atoms fall inward.

Accepted Answer

A) True 
 B)False

Question 11

When a large gas cloud starts to collapse in a free-fall due to gravity, the rotation rate will ______________.

Accepted Answer

The answer of When a large gas cloud starts to...

Question 12

After a protostar has progressed in its development, it will have a dense inner part and an outer envelope called a(n) ____.

Accepted Answer

A)  outer-protostar 
B)  Bok globules 
C)  upper proto-sphere 
D)  cocoon nebulae 
E)  planetary nebulae 
A)  outer-protostar 
B)  Bok globules 
C)  upper proto-sphere 
D)  cocoon nebulae 
E)  planetary nebulae

Question 13

Convection is important in stars because it transports energy outward in the star.

Accepted Answer

A) True 
 B)False

Question 14

When a large gas cloud starts to collapse in a free-fall due to gravity, the temperature of the gas will _____________.

Accepted Answer

The answer of When a large gas cloud starts to...

Question 15

Where is the Trapezium found?

Accepted Answer

A)  in the constellation Trapium 
B)  in the Orion Nebula 
C)  in all protostars 
D)  in all cocoon nebulae 
E)  in the Bok globules 
A)  in the constellation Trapium 
B)  in the Orion Nebula 
C)  in all protostars 
D)  in all cocoon nebulae 
E)  in the Bok globules

Question 16

The Sun, a one solar mass star, will take approximately how many years to go from protostar to main sequence star?

Accepted Answer

A)  160,000 years 
B)  700,000 years 
C)  8 million years 
D)  30 million years 
E)  100 million years 
A)  160,000 years 
B)  700,000 years 
C)  8 million years 
D)  30 million years 
E)  100 million years

Question 17

Main sequence O stars have convective cores because they fuse hydrogen in the proton-proton chain.

Accepted Answer

A) True 
 B)False

Question 18

Stellar winds and _____ will eventually blow away the protostellar disk and remnant cocoons of a protostar apart.

Accepted Answer

A)  gas jets 
B)  magnetic fields 
C)  shock waves 
D)  radiation pressure 
E)  gravity waves 
A)  gas jets 
B)  magnetic fields 
C)  shock waves 
D)  radiation pressure 
E)  gravity waves

Question 19

Hydrostatic equilibrium is the balance between _____________ and radiation _____________.

Accepted Answer

The answer of Hydrostatic equilibrium is the balance between _____________...

Question 20

One of the factors that a large molecular cloud must overcome in order for gravitational contraction to begin is the thermal energy of the gas.

Accepted Answer

A) True 
 B)False

Exam 11: Formation and Structure of Stars

Low mass stars like the Sun transport energy near their surface using convection.

Star clusters are important to the study the stellar evolution because stars in a given cluster have the same _____________.

Whatis a protostar and how does it get its energy?

The nuclear reactions in a star's core burn steadily so long as the relationship between _____________ and_____________ is stable.

Theforce responsible for the collapse of an interstellar cloud is_____________.

Eighty percent of the stars on the H-R Diagram are on the main sequence, and that is because the star is in hydrostatic equilibrium due to the _____.

What istheresistanceofagastotheflowofradiation?

What is the difference between the proton-proton chain and the CNO cycle?

Before a giant molecular cloud can contract gravitationally, it must overcome four physical factors that resist compression. What are these four factors?

When a large gas cloud starts to collapse in a free-fall due to gravity, it will start to cool down as it contracts because of the atoms fall inward.

When a large gas cloud starts to collapse in a free-fall due to gravity, the rotation rate will ______________.

After a protostar has progressed in its development, it will have a dense inner part and an outer envelope called a(n) ____.

Convection is important in stars because it transports energy outward in the star.

When a large gas cloud starts to collapse in a free-fall due to gravity, the temperature of the gas will _____________.

Where is the Trapezium found?

The Sun, a one solar mass star, will take approximately how many years to go from protostar to main sequence star?

Main sequence O stars have convective cores because they fuse hydrogen in the proton-proton chain.

Stellar winds and _____ will eventually blow away the protostellar disk and remnant cocoons of a protostar apart.

Hydrostatic equilibrium is the balance between _____________ and radiation _____________.

One of the factors that a large molecular cloud must overcome in order for gravitational contraction to begin is the thermal energy of the gas.

Here and Now

A Users Guide to the Sky

Moon Phases and Eclipses

Origins of Modern Astronomy

Gravity

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Interstellar Medium

Stellar Evolution

Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies

Supermassive Black Holes and Active Galaxies

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth the Active Planet

The Moon and Mercury

Venus and Mars

Jupiter and Saturn

Uranus Neptune Pluto and the Kuiper Belt

Meteorites Asteroids and Comets

Astrobiology

Filters

The nuclear reactions in a star's core burn steadily so long as the relationship between _ and_ is stable.

Hydrostatic equilibrium is the balance between _ and radiation _.