We all know the universe is big - very big. But how do we know? That will be the topic of a lecture Wednesday afternoon by Desika Narayanan, astronomer at the Steward Observatory. His talk is part of ...

A proposed five-satellite Cosmic Positioning System could measure cosmic distances directly and help address discrepancies in the Hubble constant through solar system–scale triangulation.

Hubble tension reveals discrepancies in cosmic expansion rates, leading to investigations of rotating universes and their ...

For decades, cosmologists have wondered if the large-scale structure of the universe is a fractal: if it looks the same no matter the scale. And the answer is: no, not really. But in some ways, yes.

One of the ways massive stars, those at least 10-times bigger than the Sun, reach their end is in a supernova—an enormous explosion caused by the star’s core running out of fuel. One consequence of a ...