The expansion of the Universe is not constant ... Our Sun is on one of the spiral arms as shown in the diagram: The Sun's orbital speed is determined almost entirely by the gravitational pull ...

Learn how Hubble is measuring the expansion rate of the Universe in this new explainer from NASA's Goddard Space Flight ...

A new idea about cosmic expansion has emerged that might remove the need for dark matter and dark energy altogether.

"The new model can account for both structure formation and stability, and the key observational properties of the expansion ...

A bold new theory suggests the universe didn’t begin with a single Big Bang, but instead unfolds through a series of ...

In the search to understand how the universe came to be, a new theory is rewriting the script. Instead of one massive, fiery ...

"The new model can account for both structure formation and stability, and the key observational properties of the expansion of the universe at ... find that the Hubble diagram exhibits jumps ...

Cosmic inflation is a faster-than-light expansion of the universe that spawned many others. Inflation was invented to explain a couple of features of the universe that are really hard to explain ...