ES Lesson 11-14 QUIZ RETAKE

What does 'singularity' mean in the context of the Big Bang? (1-2 complete sentences)

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How long ago did the Big Bang take place?

• 100 billion years ago

• 10 billion years ago

• 13.7 billion years ago

True or False: Before the Big Bang - time, space and matter did not exist.

• True

• False

During the first burst of expansion, which is known as ____________, the universe grew exponentially and doubled in size at least 90 times.

• Inflation

• Expansion

• Aggravation

What key event occurred approximately 3 minutes after the Big Bang?

• Formation of protons and neutrons

• Nucleosynthesis of hydrogen and helium nuclei

• Recombination of electrons with nuclei

• Formation of the first galaxies

Approximately how long after the Big Bang did the first galaxies begin to form?

• 3 minutes

• 380,000 years

• 500 million to 1 billion years

• 9 billion years

When did the formation of our solar system occur relative to the Big Bang?

• 1 billion years after the Big Bang

• 3 billion years after the Big Bang

• 6 billion years after the Big Bang

• 9 billion years after the Big Bang

What is the Cosmic Microwave Background (CMB) radiation? (1-2 complete sentences)

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True or False: Protons and neutrons formed at the same time as neutral hydrogen and helium atoms.

• True

• False

Why did the universe become transparent to light about 380,000 years after the Big Bang?

• The first stars ignited

• Protons and neutrons formed

• Electrons combined with nuclei, forming neutral atoms

• Gravity pulled gas into dense regions