This photo, taken by a satellite in 2003, shows the most distant parts of the universe as observed from Earth. The different colors represent differences in temperature, which correspond to different densities of matter. (Red and yellow areas are hotter, and dark-blue areas are cooler.) These densities later became stars and galaxies. This discovery won the 2006 Nobel Prize in Physics. Take a few moments to study this image. Circle the areas in the image that you think indicate areas that contain more matter.

Box the areas in the image that you think show areas containing less matter. Notice that most of the image is the same color, meaning most of the radiation is the same temperature. Write a paragraph explaining, in your own words, how this observation provides evidence to support the big bang theory.

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