Expansion of the Universe Visualizations

This video shows visualizations of the universe expanding at a constant rate versus an accelerated rate. Scientists know that the universe is expanding at an accelerated rate, but they don’t know why – yet. Missions such as Euclid and NASA’s Nancy Grace Roman Telescope aim to find out. Learn more at https://go.nasa.gov/3PHv9YY

In this side-by-side comparison, the universe is show expanding at a constant rate (represented by the expanding sphere on the left) versus an accelerating rate (represented by the expanding sphere on the right). Each dot on the spheres represents a galaxy and shows how galaxies move apart from each other faster in the universe that has an accelerating rate of expansion.