Checkpoint 3

Front

What is a spiral galaxy?

Back

A type of galaxy characterized by its spiral structure with arms that extend outward from the center.

Front

What is an elliptical galaxy?

Back

A type of galaxy that has an oval shape and lacks the defined structure of spiral galaxies.

Front

What is an irregular galaxy?

Back

A type of galaxy that does not have a defined shape or structure, often appearing chaotic.

Front

What does the Hertzsprung-Russell diagram show?

Back

It shows the relationship between a star's luminosity (brightness) and its temperature.

Front

What are the main components of a spiral galaxy?

Back

Stars, gas, dust, and a central bulge, often with a supermassive black hole.

Front

What is the difference between a barred spiral galaxy and a regular spiral galaxy?

Back

A barred spiral galaxy has a central bar-shaped structure made of stars, while a regular spiral galaxy does not.

Front

What is luminosity in the context of stars?

Back

Luminosity is the total amount of energy emitted by a star per unit of time, often measured in watts.

Front

What is the significance of a star's temperature?

Back

A star's temperature affects its color, luminosity, and stage in the stellar life cycle.

Front

What are the stages of a star's life cycle?

Back

Main sequence, red giant, supernova, neutron star or black hole, depending on the mass.

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.