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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?

Increase in gravitational force Signup and view all the answers

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

Protostar Signup and view all the answers

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

Stellar clusters Signup and view all the answers

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

Nuclear fusion Signup and view all the answers

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

Stars undergoing nuclear fusion of hydrogen into helium Signup and view all the answers

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

Its mass Signup and view all the answers

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

The core starts to collapse but the star slowly puffs up Signup and view all the answers

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

It becomes a subgiant or giant star Signup and view all the answers

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

The star runs out of fuel within days Signup and view all the answers