Galaxies and their Black Holes

What is a significant challenge in understanding the formation of black holes in the early universe?

• The absence of galaxies in the early universe

• The lack of observational data

• The rapid expansion of the universe

• The difficulty in constructing models for large black holes

What is the fundamental question in galaxy formation discussed in the video?

• How do black holes emit radiation?

• Does the galaxy determine the black hole's properties or vice versa?

• Why are galaxies different sizes?

• How do galaxies form stars?

What fraction of a galaxy's mass do black holes typically represent?

• About 50%

• Nearly 100%

• Approximately 10%

• A few tenths of a percent

How can a black hole affect the gas in a galaxy?

• By cooling the gas

• By absorbing all the gas

• By releasing energy that can expel the gas

• By converting gas into stars

What evidence suggests that black holes impact the interstellar medium?

• The presence of dark matter

• The formation of new stars

• Jets of material and bubbles of hot gas

• The rotation speed of galaxies