Video quiz on Quasars and the Universe

What is the intergalactic medium primarily composed of?

• Iron and nickel

• Carbon and silicon

• Oxygen and nitrogen

• Hydrogen and helium

What are quasars?

• Comets with bright tails

• Stars that emit radio waves

• Planets with high energy

• The active cores of distant galaxies

How do quasars generate their immense energy?

• From gravity pulling matter into black holes

• By reflecting sunlight

• By burning hydrogen

• Through nuclear fusion

What is an accretion disk?

• A massive orbiting disk of gas around a black hole

• A type of galaxy

• A ring of planets around a star

• A collection of asteroids

What happens to matter as it falls into a black hole?

• It becomes a star

• It speeds up and heats up

• It slows down and cools

• It turns into dark matter

Why can't hot gas form stars?

• Hot gas turns into black holes

• Hot gas is too dense

• Hot gas exerts pressure that resists gravity

• Hot gas is too far from galaxies

What effect do quasars have on their galaxies?

• They cool down the gas

• They turn gas into dark matter

• They stop star formation by heating the gas

• They create new stars

What is the significance of quasars in the early universe?

• They were formed by supernovae

• They were only found in the Milky Way

• They were rare and insignificant

• They were common and very bright

What might happen when the Milky Way merges with Andromeda?

• The black holes will turn into stars

• All stars will explode

• The Milky Way will disappear

• A new quasar could form

What is the primary fuel for quasars?

• Solar energy

• Matter falling into black holes

• Dark matter

• Hydrogen fusion