Life cycle of Stars

Stars are formed from big clouds of gas and dust is known as:

• dust cloud

• space fog

• neutron clouds

• nebulae

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The only force acting on the nebulae is:

• thermal expansion

• singularities

• gravity

• microscopic adhesion

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A star is born when:

• nuclear fusion starts

• a nebula becomes a protostar

• gases in a nebula condense

• hydrogen is used up in fusion processes

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Which is an accurate description of determining a stars life span? 

• the less mass of the star the longer the life span
• stars never die
• all stars shine the same
• stars don't have a life cycle

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Smaller stars lifespan would be

• longer than giant stars
• shorter than giant stars
• the same length of time as giant stars
• changes depending on the color of star

Main sequence stars are made primarily of which elements?

• Hydrogen only

• Helium and Carbon

• Carbon and Iron

• Hydrogen and Helium

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The stable and longest lasting period of a star’s life cycle is called:

• The birth of a star

• Nebula

• Neutron star

• Main Sequence

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What fuel do stars use? 

• Oxygen
• Hydrogen
• Carbon
• Iron

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What is a celestial body that is composed of gas and emits light from nuclear fusion reactions?

• Nebula

• Star

• Galaxy

• Planet

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At 10,000 degrees Celsius, hydrogen begins to change into helium and energy is released in a process called

• supernova
• pulsar
• nuclear fusion
• nuclear fission

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