What did early astronomers believe about the universe?

• It was shrinking.

• It was static and unchanging.

• It was constantly changing.

• It was expanding.

Who was the astronomer that first observed redshift in spiral nebulae?

• Vesto Slipher

• Edwin Hubble

• Georges Lamaitre

• Albert Einstein

What did Georges Lamaitre propose about the universe?

• It was contracting.

• It was shrinking.

• It was static.

• It was expanding.

What is the Big Bang theory?

• A theory that the universe is contracting.

• A theory that the universe began with a massive expansion.

• A theory that the universe is shrinking.

• A theory that the universe is static.

What evidence supports the Big Bang theory?

• The universe is static.

• The cosmic microwave background.

• The universe is shrinking.

• The universe is contracting.