Understanding the Universe and Stars

What did Hubble's observations reveal about the universe?

• The universe is shrinking.

• The universe is expanding.

• The universe is static.

• The universe is contracting.

How does the Cosmic Microwave Background (CMB) change as the universe ages?

• It becomes more blue.

• It remains the same.

• It becomes more red.

• It becomes colder.

What is the significance of redshift in astronomy?

• It indicates a star's temperature.

• It shows the universe is expanding.

• It measures a star's brightness.

• It reveals a star's age.

What are standard candles used for in astronomy?

• To measure the temperature of stars.

• To determine the age of the universe.

• To calculate the mass of galaxies.

• To measure distances in space.

What happens to stars as they age?

• They become colder.

• They remain the same.

• They change color.

• They disappear.