World Science Scholars
3.3 Large-scale Uniformity

The cosmic background radiation is the strongest evidence of the large-scale uniformity of the universe. In reality, the cosmic background is uniform to 1 part in 100,000. Inflation suggests that the universe began so small that uniformity could be easily established; then, inflation stretched the uniform region to be large enough to include the visible universe. But just how uniform is 1 part per 100,000? This demonstration gives a visual representation of slight non-uniformities. A sphere is rendered using 100,000 blue dots. As you increase the level of non-uniformity, blue dots are replaced by red dots. Take a look at how minuscule 1 part in 100,000 truly is. Try dragging the sphere around and zooming in or out by placing your mouse cursor on the sphere and scrolling.



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