Life Cycle of Stars

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Questions and Answers

What determines the lifetime of a main-sequence star?

  • The rate at which it burns its hydrogen supply (correct)
  • The temperature of its surface
  • Its distance from the Earth
  • The size of its planetary system

What is the relationship between the mass and luminosity of a main-sequence star?

  • Luminosity is proportional to the square root of mass
  • Luminosity is proportional to the cube and a half of mass (correct)
  • Luminosity increases linearly with mass
  • Luminosity increases exponentially with mass

How does the lifetime of a 10 M⊙ star compare to that of the Sun?

  • It is about 10 times longer
  • It is about 30 million years, whereas the Sun's is about 10 billion years (correct)
  • It is about 100 times shorter
  • It is about the same

What can be inferred about a star from its luminosity?

<p>Its rate of hydrogen burning (B)</p> Signup and view all the answers

What is the approximate lifetime of a star with a mass of 3 Rsun?

<p>1 billion years (C)</p> Signup and view all the answers

What is the primary reason why molecular clouds can form hydrogen molecules?

<p>Because of low temperature (A)</p> Signup and view all the answers

Why does the cloud contract and form a dense, hot protostar?

<p>Because of the lack of thermal pressure (A)</p> Signup and view all the answers

What is the primary factor that determines the mass limit of main sequence stars?

<p>Radiation pressure (D)</p> Signup and view all the answers

What is the main characteristic of brown dwarfs that distinguishes them from main sequence stars?

<p>Their inability to sustain core hydrogen fusion (D)</p> Signup and view all the answers

What is the primary effect of a large star's mass on its nuclear fusion rate?

<p>It increases the nuclear fusion rate (A)</p> Signup and view all the answers

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