There are two main pieces of evidence supporting the Big Bang Theory and that our universe is continually expanding: Doppler shift and Cosmic Background Radiation.
Chat Requirements

Explain to your teacher how the Doppler shift and Cosmic Background Radiation are used to understand the history of the development of earth.
Explain how both provide evidence to the expansion of the universe. You can use information from the lesson and any research you find from other sources.

and how is doppler shift related to earth's background?

Question

There are two main pieces of evidence supporting the Big Bang Theory and that our universe is continually expanding: Doppler shift and Cosmic Background Radiation.
Chat Requirements

    Explain to your teacher how the Doppler shift and Cosmic Background Radiation are used to understand the history of the development of earth.
    Explain how both provide evidence to the expansion of the universe. You can use information from the lesson and any research you find from other sources.

and how is doppler shift related to earth's background?