Question

explain the Doppler shift and Cosmic Background Radiation-what they are and why they're important to how our earth was created.

Also, explain how they provide evidence to how our universe expanded.

Answer 1

A doppler shift occurs when an object that is moving toward or away from you emits a form of energy in waves. They compress if it approaches you, and stretch if it is moving away. The Doppler shift is evidence of an expanding universe (light waves are stretched), but from what? The CMBR (Cosmic Microwave Background Radiation) is evidence of the moments just after the Big Bang, so the expanding universe started with a BANG - it wasn't static or always there. The radiation lies at a distance of approximately 13.7 billion light years, which means that it occurred about 13.7 billion years ago. Now, how does that relate to how our earth was created? It gives clues to the formation of the first elements and how they were distributed, and the time it would take them to coalesce into clusters, galaxies, stars, planets, etc.