Q: What are the two pieces of evidence for the Big Bang theory?

Flexi Says: The Big Bang theory states that the universe was begun after a gigantic explosion that caused the universe to expand. Key evidence that supports this theory includes cosmic background radiation and redshifting:

• In a static Universe, the space between objects should have no heat at all. The temperature should measure 0 K (Kelvin is an absolute temperature scale). But researchers discovered extra microwave energy, which causes the temperature to be 3 K rather than 0 K. This tiny amount of heat, or "background radiation," is left over from the Big Bang.
• Redshifting occurs when light is either moving away from an object, or the distance between the light and the object is expanding. Almost all of the galaxies in the universe have a redshift, which indicates that they are moving away, or continually expanding. Looking back in time, the evidence shows that all matter in the universe started as a point and then exploded outward.