Sim Zoom (VIDEO)

Durham University

Caption

Simulations of the formation of a group of galaxies in an expanding universe, featuring no cosmological constant (left) and a very large cosmological constant (right). In the color scheme, lighter colors represent denser parts of the universe, when gravity is drawing matter together into galaxies. The simulation runs for 15 billion years. Without a cosmological constant (left), matter comes together under the attractive force of gravity into smaller galaxies, which combine into a large galaxy. With a large cosmological constant (right), the faster expansion of the universe stops matter from grouping together, and galaxies fail to form.

Credit

Luke A. Barnes, Pascal J. Elahi, Jaime Salcido, Richard G. Bower, Geraint F. Lewis/EAGLE

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