Understanding Redshift and the Big Bang

What is the observed shift in the spectral lines of light from distant galaxies called?

• Blue shift

• Red shift

• Green shift

• Infrared shift

Why do spectral lines from distant galaxies appear shifted towards the red end of the spectrum?

• The galaxies are moving towards us

• The light is absorbed by space dust

• The universe is expanding, stretching the light waves

• The galaxies are producing less light

How does the redshift of a galaxy relate to its distance from Earth?

• The further away a galaxy is, the more its light is redshifted

• The closer a galaxy is, the more its light is redshifted

• Redshift is the same for all galaxies regardless of distance

• The redshift decreases as a galaxy moves further away

Which of the following best explains why light from very distant galaxies is more redshifted than light from nearer galaxies?

• Distant galaxies are emitting red light naturally

• The further the light travels, the more space stretches it

• The galaxies are moving towards us

• The light gets weaker as it travels

The stretching of light waves due to the expansion of space is known as:

• The Doppler effect

• The Cosmic Background Radiation

• Gravitational lensing

• Cosmological redshift

The observation of redshifted light from distant galaxies provides evidence for:

• The steady state theory

• The Big Bang theory

• The geocentric model

• The idea that the universe is shrinking

What is the Cosmic Microwave Background Radiation (CMBR)?

• Radiation from distant galaxies

• Leftover radiation from the Big Bang, now stretched to microwave wavelengths

• A type of radio signal from stars

• High-energy gamma rays from black holes

Why is CMBR considered strong evidence for the Big Bang theory?

• It proves that galaxies are moving closer together

• It is present throughout the universe and shows the universe was once hot and dense

• It was created by stars burning fuel billions of years ago

• It shows that the universe has always been the same size

What happened to the high-energy gamma radiation released during the Big Bang?

• It remained as gamma radiation

• It was absorbed by stars and planets

• It was stretched as the universe expanded, becoming microwave radiation

• It disappeared over time

How do both redshift and CMBR support the Big Bang Theory?

• They both suggest the universe has always existed in its current state

• They both show that galaxies are shrinking

• They both indicate that the universe started from a single point and has been expanding

• They both prove that stars are getting hotter