What are the two populations of stars in our galaxy?

• Population I and Population II

• Population A and Population B

• Population X and Population Y

• Population Alpha and Population Beta

Match the following compositions with their descriptions of the early universe.

• Estimated composition with more helium

• 50% hydrogen and 50% helium

• Estimated composition with less helium

• 80% hydrogen and 20% helium

• Hypothetical balanced composition

• 90% hydrogen and 10% helium

• Primordial composition after the Big Bang

• 70% hydrogen and 30% helium

What process refers to the creation of chemical elements in stars?

• Photosynthesis

• Nucleosynthesis

• Metamorphosis

• Crystallization

What analogy is used to describe the early universe's composition?

• Flour and eggs to a baker

• Salt and pepper to a chef

• Sugar and spice to a cook

• Water and oil to a painter

What do stars use to make energy?

• Nuclear fusion

• Chemical reactions

• Solar power

• Wind energy

What happens to a star as it ages?

• It becomes a black hole

• It takes off its coat in the form of a planetary nebula

• It explodes immediately

• It shrinks into a white dwarf

What is the main difference between Population I and Population II stars?

• Age and metal content

• Size and brightness

• Temperature and color

• Distance from Earth

Match the following roles of metals with their effects on star formation.

• Metals are crucial for the formation of new stars.

• They are not involved

• Metals hinder the formation of new stars.

• They are essential ingredients

• Metals have no role in the formation of new stars.

• They slow down the process

• Metals influence stars that have already formed.

• They only affect older stars

What do newer stars have compared to older stars?

• Lower amounts of metals

• Higher amounts of metals

• The same amount of metals

• No metals at all

Where are extreme population I stars found?

• In the central bulge

• In the spiral arms of our galaxy

• In the galaxy's halo

• In globular clusters