Unit Test 4.1, 4.2, & 4.3 Review

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What is a white dwarf?

Back

A white dwarf is a super dense, hot, planet-sized core left behind after a star like the Sun has exhausted its nuclear fuel and shed its outer layers.

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What defines a Main Sequence star?

Back

A Main Sequence star is a star that is in the stable phase of its life cycle, where it fuses hydrogen into helium in its core.

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What is a planetary nebula?

Back

A planetary nebula is the outer layers of a star that are expelled during the later stages of its life, often after it has become a red giant.

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What is a brown dwarf?

Back

A brown dwarf is a substellar object that does not have enough mass to ignite hydrogen fusion in its core, failing to become a true star.

Front

How do high-mass stars differ from low-mass stars in terms of lifespan?

Back

High-mass stars have much shorter lifespans than low-mass stars because they fuse elements at much hotter and faster rates.

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What happens to the Sun when it runs out of helium?

Back

When the Sun runs out of helium, it will lose the battle with gravity, and its outer layers will be expelled, leaving behind a planetary nebula.

Front

What is the significance of the H-R Diagram?

Back

The H-R Diagram (Hertzsprung-Russell Diagram) is a graphical representation of stars, showing the relationship between their luminosity and temperature.

Front

What is a neutron star?

Back

A neutron star is the remnant core of a massive star that has undergone a supernova explosion, consisting mostly of neutrons.

Front

What is a black hole?

Back

A black hole is a region of space where the gravitational pull is so strong that nothing, not even light, can escape from it.

Front

What is a supernova remnant?

Back

A supernova remnant is the structure resulting from the explosion of a star in a supernova, consisting of the expelled material and shock waves.