Understanding the Expanding Universe

The video explores Edwin Hubble's contributions to astronomy, including the categorization of galaxies and the discovery of their movement away from each other, leading to the understanding of the expanding universe. It explains the Doppler effect and its application to light, resulting in redshift observations that support the Big Bang theory. Hubble's Law is introduced, relating galaxy recession velocity to distance, providing further evidence for the universe's expansion.

What major shift in understanding did early astronomers make about the center of our universe?

• From the Moon to Mars

• From the Milky Way to the Andromeda Galaxy

• From the Earth to the Sun

• From the Sun to the Earth

What did astronomers discover about many objects previously thought to be nebulae?

• They were actually black holes

• They were new types of stars

• They were clusters of asteroids

• They were entire galaxies

What is the Doppler effect in relation to sound waves?

• Sound waves increase in speed as they move away

• Sound waves decrease in speed as they move away

• Sound waves change in frequency based on motion

• Sound waves remain constant regardless of motion

What happens to the light from a galaxy moving away from us?

• It shifts towards the blue end of the spectrum

• It shifts towards the red end of the spectrum

• It remains unchanged

• It becomes invisible

What did Hubble's observations of redshifted galaxies suggest about the universe?

• The universe is static

• The universe is rotating

• The universe is contracting

• The universe is expanding

What analogy is used to explain the expansion of the universe?

• A spinning top

• A growing tree

• A stretching rubber band

• An inflating balloon

According to Hubble's Law, what is the relationship between a galaxy's distance and its recession velocity?

• They are equal

• They are unrelated

• They are directly proportional

• They are inversely proportional

What unit is used to measure the distance in Hubble's Law?

• Parsecs

• Megaparsecs

• Kilometers

• Light years

What constant is used in Hubble's Law to relate velocity and distance?

• The Planck constant

• The Hubble constant

• The Speed of light

• The Gravitational constant

What cosmological model was suggested by Hubble's observation of receding galaxies?

• The Multiverse Theory

• The Big Bang Theory

• The Steady State Theory

• The Oscillating Universe Theory