Unit 6 Lesson 4 Quiz

Which of the following is the classification for the most massive stars?

• Supergiant

• Giant

• White dwarf

• Protostar

Imagine you are an astronomer studying a star in its prime, undergoing nuclear fusion. What phase would you say the star is in?

• Black hole

• White dwarf

• Main sequence

• Nebula

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You are an astronaut exploring the universe. You come across a cloud of gas. You remember from your training that this is where stars form. What is this cloud of gas called?

• Black hole

• Black dwarf

• Nebula

• Red Giant

Imagine you are an astronomer studying stars. You notice that larger stars release a lot of energy in an explosion. What is this phenomenon known as?

• Black dwarf

• Neutron star

• Supernova

• Black Hole

What is NOT produced when light elements undergo nuclear fusion?

• Heavier elements

• Energy 

• Lighter elements

• Light

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What process begins when a protostar reaches a temperature and density high enough for nuclear fusion to start?

• He to O fusion

• H to He fusion

• C to O fusion

• fission

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What is the Sun mostly made of?

• Stars
• Hydrogen and Helium
• Oxygen
• Carbon Dioxide

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About 90% of the stars in the Universe are Main Sequence stars. What do all main sequence stars have in common?

• They are all red from producing Neon

• They are all producing iron at their core.

• They are out of fuel and not producing any new elements.

• They are all producing Helium.

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Nuclear fusion allows stars to produce all of the following except what?

• elements

• gravity

• energy

• light

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The process of combining two nuclei to form a new element results in the release of what?

• Smoke and radio wave

• Energy in the form of sunlight

• Water vapor and x-rays

• Energy in the form of Dark matter

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