What is one piece of evidence that supports the Big Bang Theory? A the rotation and revolution of Earth B the universe formed over 13 billion years ago C the universe is cooling down D a weak signal of cosmic microwave background radiation Which of the following is the main idea in paragraph 2? . A history of the Hubble Space Telescope B background on the Cosmic Background Explorer satellite C explanation of the Big Bang Theory

## Step 1<br />The first question is asking for evidence that supports the Big Bang Theory. The Big Bang Theory is a cosmological model that describes the universe from the earliest known periods through its subsequent large-scale evolution. The theory proposes that the universe was once extremely compact, dense, and hot. A massive explosion occurred that caused the universe to expand and cool to its current state.<br /><br />## Step 2<br />The second question is asking for the main idea in paragraph 2. The main idea of a paragraph is the primary concept or point that the author is trying to convey in that paragraph.