Lesson 1: What is the Big Bang Theory?

Before the mid-20th century, what was the prevailing scientific belief about the universe?

• It was constantly expanding.

• It was infinite and ageless.

• It was created by the Big Bang.

• It was contracting.

Which of the following discoveries provided significant evidence for the Big Bang theory, making it the accepted scientific theory?

• The discovery of black holes.

• The theory of general relativity and the expansion of galaxies.

• The accidental discovery of cosmic background radiation.

• Both B and C.

According to the video, what was the Big Bang primarily?

• A massive explosion in space.

• Space stretching everywhere, all at once.

• The creation of matter from nothing.

• A collision of two universes.

What was the approximate ratio of matter particles to antimatter particles that allowed matter to dominate the universe?

• 1 matter particle for every 1 antimatter particle.

• 1 billion matter particles for every 1 antimatter particle.

• 1 billion and 1 matter particles for every 1 billion antimatter particles.

• 1 antimatter particle for every 1 billion matter particles.

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During the Nucleosynthesis Era, what was the first atom formed as the universe cooled and neutrons decayed into protons?

• Helium

• Oxygen

• Hydrogen

• Carbon

Why was the period after atoms formed, but before stars and galaxies, referred to as the "Dark Age"?

• There was no light in the universe at all.

• There were no stars, and hydrogen gas prevented visible light from moving around.

• The universe was filled with dark matter, blocking all light.

• It was a period of intense cold and no energy.