Stars and Their Life Cycles

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Questions and Answers

What are stars primarily composed of?

  • Hydrogen and helium (correct)
  • Helium and lithium
  • Carbon and silicon
  • Oxygen and nitrogen

What are molecular clouds?

  • Large balls of gas
  • Large clouds of gas and dust (correct)
  • Hot regions in space
  • Clusters of stars

What is the primary cause of gas clumping in molecular clouds?

  • Strong magnetic fields
  • High temperatures
  • Cold temperatures (correct)
  • Intense radiation

What is the result of clumps in molecular clouds gathering more matter?

<p>Increase in gravitational force (D)</p> Signup and view all the answers

What is the product of the collapse of a clump in a molecular cloud due to gravity?

<p>Protostar (B)</p> Signup and view all the answers

What do we call batches of stars that have recently formed from molecular clouds?

<p>Stellar clusters (B)</p> Signup and view all the answers

What process releases energy in a star's core, preventing it from collapsing?

<p>Nuclear fusion (D)</p> Signup and view all the answers

Which stars are termed 'main sequence stars' by astronomers?

<p>Stars undergoing nuclear fusion of hydrogen into helium (D)</p> Signup and view all the answers

What determines how rapidly a star runs through its fuel supply?

<p>Its mass (C)</p> Signup and view all the answers

What happens when a star's core runs out of hydrogen to convert into helium?

<p>The core starts to collapse but the star slowly puffs up (A)</p> Signup and view all the answers

What is the end fate of a low-mass star like our Sun?

<p>It becomes a subgiant or giant star (C)</p> Signup and view all the answers

What happens when silicon fuses into iron in a high-mass star?

<p>The star runs out of fuel within days (A)</p> Signup and view all the answers

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