Unit Test 4.1, 4.2, & 4.3 Review

Front

What is a brown dwarf?

Back

A brown dwarf is a celestial object that does not accumulate enough hydrogen gas to ignite fusion in its core, failing to become a star.

Front

What determines a star's life cycle?

Back

The mass of a star determines its life cycle.

Front

What process do stars use to produce light?

Back

Stars produce light by the fusion of elements in their core.

Front

What is a galaxy?

Back

A galaxy is a huge collection of billions of stars, gas, dust, and dark matter that is held together by gravity.

Front

What will happen to the Sun as it runs out of helium?

Back

The Sun will lose the battle with gravity, and its outer layers will be blown off, leaving behind a planetary nebula.

Front

What is the H-R Diagram?

Back

The H-R Diagram (Hertzsprung-Russell Diagram) is a scatter plot of stars showing the relationship between their absolute magnitudes or luminosities versus their stellar classifications or effective temperatures.

Front

What is fusion in the context of stars?

Back

Fusion is the process by which stars combine lighter elements, like hydrogen, into heavier elements, releasing energy in the form of light and heat.

Front

What is a supernova?

Back

A supernova is a powerful and luminous explosion that occurs at the end of a star's life cycle, often resulting in the formation of a neutron star or black hole.

Front

What is a neutron star?

Back

A neutron star is the remnants of a supernova explosion, composed almost entirely of neutrons, and is incredibly dense.

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.