How does galaxy composition typically relate to the age of the stars in the galaxy?(1 point)

Question

Responses

Stars form from dust and gas, so galaxies with younger stars typically consist of higher proportions of dust and gas than other galaxies.
Stars form from dust and gas, so galaxies with younger stars typically consist of higher proportions of dust and gas than other galaxies.

Star aging emits gas and dust, so galaxies with the youngest stars typically have the lowest proportions of dust and gas.
Star aging emits gas and dust, so galaxies with the youngest stars typically have the lowest proportions of dust and gas.

Star formation and the presence of young stars is common across galaxies, regardless of the proportions of dust and gas present.
Star formation and the presence of young stars is common across galaxies, regardless of the proportions of dust and gas present.

Answer 1

The correct response is:

Stars form from dust and gas, so galaxies with younger stars typically consist of higher proportions of dust and gas than other galaxies.

This is because young stars are often formed in regions rich in gas and dust, which are the raw materials for star formation. Galaxies that are actively forming stars will have more of these materials compared to older galaxies where star formation has slowed or ceased, resulting in an aging stellar population and less available gas and dust.