The idea that the universe began from a single point and expanded to its current size explains a large number of observations, including those in the table below. Observations Explained The universe consists mostly of low-mass elements. Cosmic microwave background is nearly the same in all directions. Light from other galaxies shows that these galaxies are moving away from Earth. In addition, many predictions based on the idea have led to additional observations that support it. Which best describes this idea of the origin of the universe? hypothesis theory law fact