How was the universe generally perceived by most scientists up to the middle of the 20th century?

• As constantly expanding and contracting.

• As infinite and ageless.

• As having a definite beginning and end.

• As a static, unchanging entity.

Which of the following discoveries provided significant observational evidence that led to the Big Bang becoming the accepted theory in science?

• The theory of relativity and the discovery of black holes.

• The expansion of galaxies and cosmic background radiation.

• The existence of dark matter and dark energy.

• The formation of the first stars and planets.

The Big Bang theory suggests that the universe began as a __________, extremely hot and dense point.

About __________ billion years ago, the universe began expanding rapidly from that tiny, dense state.

As the universe cooled, particles combined to form the simplest atoms: __________ and helium.

Over time, gravity pulled matter together to form __________, galaxies, and eventually planets.

What is the Big Bang described as?

• A massive explosion from a single point.

• The sudden appearance of matter from nothing.

• All space stretching everywhere at once.

• A collision of multiple universes.

What was the outcome of the interaction between matter and antimatter in the early universe?

• Equal amounts of matter and antimatter were formed.

• Antimatter completely annihilated all matter.

• Matter won over antimatter, leaving almost all matter and nearly no antimatter.

• They combined to form a new type of energy.

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Why was a period in the early universe referred to as the "Dark Age"?

• Because the universe was filled with dark matter.

• Because there were no stars and hydrogen gas blocked visible light.

• Because the temperature was too low for any light to exist.

• Because all light was absorbed by black holes.