Chapter 4 Retest

Front

What is the Big Bang theory?

Back

The Big Bang theory is the leading explanation for how the universe began, stating that it started as an extremely hot, tiny space that expanded out in all directions.

Front

What does the Hertzsprung-Russell diagram represent?

Back

The 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 are the stages in the Sun’s life cycle after the main sequence?

Back

The next three stages in the Sun’s life cycle are red giant, planetary nebula, and white dwarf.

Front

What is cosmic background radiation?

Back

Cosmic background radiation is the afterglow radiation from the Big Bang, providing evidence that supports the theory of the universe's origin.

Front

How do scientists understand the origin of the universe?

Back

Scientists currently understand that the universe began as a singular point and has been expanding ever since.

Front

What is a protostar?

Back

A protostar is a young star that is still in the process of forming, characterized by a dense core and surrounding gas and dust.

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.

Front

What is a red giant?

Back

A red giant is a late stage in the life cycle of a star, where it expands and cools after exhausting the hydrogen in its core.

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.