The Formation and Evolution of the Universe

Approximately how many galaxies are estimated to exist in the observable universe?

• 500 billion

• 100 million

• 2 trillion

• 1 billion

What significant discovery did Edwin Hubble make about the universe?

• The universe is contracting

• The universe is shrinking

• The universe is static

• The universe is expanding

What is the Planck length?

• The distance light travels in one second

• The largest possible length in the universe

• The average length of a galaxy

• The smallest possible length in the universe

During which era did the gravitational force separate from other forces?

• Particle Era

• Electroweak Era

• Grand Unification Era

• Planck Era

What event is believed to have sparked cosmic inflation?

• The separation of the electromagnetic force

• The separation of the strong force

• The formation of the first stars

• The cooling of the universe

What was the primary result of the imbalance between matter and antimatter?

• The creation of the universe as we know it

• Matter particles annihilated completely

• Antimatter dominated the universe

• The universe became entirely energy

What percentage of the universe's nuclei was hydrogen after 20 minutes post-Big Bang?

• 50%

• 90%

• 75%

• 25%

At what temperature did electrons begin to orbit nuclei, forming stable atoms?

• 5,000 kelvin

• 10,000 kelvin

• 3,000 kelvin

• 1,000 kelvin

How long after the Big Bang did the first stars begin to form?

• 1 billion years

• 100 million years

• 10 billion years

• 1 million years

What is the significance of cosmic microwave background radiation?

• It indicates the universe is cooling

• It proves the universe is contracting

• It is the first light of the universe

• It shows the universe is static