The Evidence Supporting the Big Bang Theory: Redshift and the Expanding Universe

The video discusses the expanding universe, focusing on red-shift as evidence for the Big Bang Theory. It explains how red-shift indicates galaxies moving away from Earth, supporting the idea of an expanding universe. The Big Bang Theory is introduced, suggesting the universe began from a dense, hot region. Cosmic microwave background radiation is presented as further evidence, being red-shifted radiation from shortly after the Big Bang. Hubble's Law is explained, showing the relationship between galaxy speed and distance, leading to the Hubble constant, which helps estimate the universe's age.

What does the red-shift observed in distant galaxies indicate about the universe?

• The universe is rotating.

• The universe is contracting.

• The universe is static.

• The universe is expanding.

According to the Big Bang Theory, what was the initial state of the universe?

• A large, cold region.

• A small, dense, and hot region.

• A collection of galaxies.

• A vast, empty space.

What is one piece of evidence supporting the Big Bang Theory?

• The presence of black holes.

• The abundance of water in the universe.

• The existence of dark matter.

• The cosmic microwave background radiation.

What did Edwin Hubble discover about the relationship between a galaxy's speed and its distance from Earth?

• Speed is directly proportional to distance.

• Speed is inversely proportional to distance.

• Speed is unrelated to distance.

• Speed decreases with distance.

What is the Hubble constant used for?

• Measuring the mass of galaxies.

• Estimating the age of the universe.

• Calculating the speed of light.

• Determining the size of stars.

How did Hubble measure the speed of galaxies moving away from Earth?

• By calculating their mass.

• By observing their color.

• By measuring their brightness.

• By using the red-shift.

What does the equation v = H₀ × d represent in Hubble's findings?

• The mass of a galaxy.

• The speed of light.

• The gravitational force between galaxies.

• The speed of a galaxy moving away from Earth.