Question 1

Using the data in the table below,identify the spectral type of a star that has a main-sequence lifetime of about 10 billion years.

Accepted Answer

A) A5 
B) F5 
C) K0 
D) G2 
E) M8 
A) A5 
B) F5 
C) K0 
D) G2 
E) M8

Question 2

What types of stars cause Type I supernovae,and what makes them explode?

Accepted Answer

Type I supernovae are formed in one or t

Question 3

If the Milky Way formed stars at approximately a constant rate over the last 14 billion years,what fraction of the M-type stars that ever formed in it can still be found as main-sequence stars today? Note that M-type stars have a mass of approximately 0.5 M⨀.

Accepted Answer

A) 10 percent 
B) 33 percent 
C) 50 percent 
D) 75 percent 
E) 100 percent 
A) 10 percent 
B) 33 percent 
C) 50 percent 
D) 75 percent 
E) 100 percent

Question 4

A low-mass star that burns helium in its core and hydrogen in a shell surrounding the core is more luminous than a similar star that burns only hydrogen in a shell around a dead core.

Accepted Answer

A) True 
 B)False

Question 5

A main-sequence star is unique because:

Accepted Answer

A) hydrostatic equilibrium exists at all radii 
B) energy transport occurs via convection throughout much of its interior 
C) carbon burning occurs in its core 
D) it emits strong surface winds 
E) hydrogen burning occurs in its core 
A) hydrostatic equilibrium exists at all radii 
B) energy transport occurs via convection throughout much of its interior 
C) carbon burning occurs in its core 
D) it emits strong surface winds 
E) hydrogen burning occurs in its core

Question 6

The Sun will become a red giant star in about 5 billion years.

Accepted Answer

A) True 
 B)False

Question 7

Which of the stellar spectral types shown below would be the least likely to have planets with life?

Accepted Answer

A) B0 
B) G2 
C) K0 
D) M0 
E) M5 
A) B0 
B) G2 
C) K0 
D) M0 
E) M5

Question 8

How many times longer does a 2 M⨀ main-sequence star live compared to a 10 M⨀ main-sequence star?

Accepted Answer

Main-sequence lifetime: τ_MS = 10¹⁰ yr × (M/M

Using the data in the table below,identify the spectral type of a star that has a main-sequence lifetime of about 10 billion years.

What types of stars cause Type I supernovae,and what makes them explode?

If the Milky Way formed stars at approximately a constant rate over the last 14 billion years,what fraction of the M-type stars that ever formed in it can still be found as main-sequence stars today? Note that M-type stars have a mass of approximately 0.5 M_⨀.

A low-mass star that burns helium in its core and hydrogen in a shell surrounding the core is more luminous than a similar star that burns only hydrogen in a shell around a dead core.

A main-sequence star is unique because:

The Sun will become a red giant star in about 5 billion years.

Which of the stellar spectral types shown below would be the least likely to have planets with life?

How many times longer does a 2 M_⨀ main-sequence star live compared to a 10 M_⨀ main-sequence star?

Why Learn Astronomy

Patterns in the Skymotions of Earth

Motion of Astronomical Bodies

Gravity and Orbits

Light

The Tools of the Astronomer

The Birth and Evolution of Planetary Systems

The Terrestrial Planets and Earths Moon

Atmospheres of the Terrestrial Planets

Worlds of Gas and Liquid the Giant Planets

Planetary Adornments Moons and Rings

Dwarf Planets and Small Solar System Bodies

Taking the Measure of Stars

Our Starthe Sun

Star Formation and the Interstellar Medium

Evolution of High-Mass Stars

Relativity and Black Holes

The Expanding Universe

Galaxies

The Milky Waya Normal Spiral Galaxy

Modern Cosmology

Large-Scale Structure in the Universe

Life

Filters

Exam 16: Evolution of Low-Mass Stars

Using the data in the table below,identify the spectral type of a star that has a main-sequence lifetime of about 10 billion years.

What types of stars cause Type I supernovae,and what makes them explode?

If the Milky Way formed stars at approximately a constant rate over the last 14 billion years,what fraction of the M-type stars that ever formed in it can still be found as main-sequence stars today? Note that M-type stars have a mass of approximately 0.5 M⨀.

A low-mass star that burns helium in its core and hydrogen in a shell surrounding the core is more luminous than a similar star that burns only hydrogen in a shell around a dead core.

A main-sequence star is unique because:

The Sun will become a red giant star in about 5 billion years.

Which of the stellar spectral types shown below would be the least likely to have planets with life?

How many times longer does a 2 M⨀ main-sequence star live compared to a 10 M⨀ main-sequence star?

Why Learn Astronomy

Patterns in the Skymotions of Earth

Motion of Astronomical Bodies

Gravity and Orbits

Light

The Tools of the Astronomer

The Birth and Evolution of Planetary Systems

The Terrestrial Planets and Earths Moon

Atmospheres of the Terrestrial Planets

Worlds of Gas and Liquid the Giant Planets

Planetary Adornments Moons and Rings

Dwarf Planets and Small Solar System Bodies

Taking the Measure of Stars

Our Starthe Sun

Star Formation and the Interstellar Medium

Evolution of High-Mass Stars

Relativity and Black Holes

The Expanding Universe

Galaxies

The Milky Waya Normal Spiral Galaxy

Modern Cosmology

Large-Scale Structure in the Universe

Life

Filters

If the Milky Way formed stars at approximately a constant rate over the last 14 billion years,what fraction of the M-type stars that ever formed in it can still be found as main-sequence stars today? Note that M-type stars have a mass of approximately 0.5 M_⨀.

How many times longer does a 2 M_⨀ main-sequence star live compared to a 10 M_⨀ main-sequence star?