Red-shift and CMB Radiation

Question 1

Explain the Doppler Effect?

Answer 1

Noise sounds lower pitched when travelling away from you because it drops in frequency.

Question 2

What does red-shift increase?

Answer 2

Wavelength

Question 3

How does red-shift show that the Universe is expanding?

Answer 3

Dark lines on the absorption spectrum of a galaxy has been red-shifted than on Earth.

Question 4

Which direction is cosmic microwave background radiation coming from?

Answer 4

All directions.