Look up at the night sky and it is easy to believe that stars and galaxies are where the universe keeps almost all of its substance. Precision measurements of the cosmos tell a different story. Most ...

This article was originally published at The Conversation. The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights. If you look across space with a telescope, you'll see ...

Add Yahoo as a preferred source to see more of our stories on Google. In space, there are four dimensions: length, width, height and time. scaliger/iStock/NASA via Getty Images Plus About a century ...

Add Yahoo as a preferred source to see more of our stories on Google. Mysterious blasts of radio waves from across the universe called fast radio bursts help astronomers catalog matter. ESO/M.

Mysterious blasts of radio waves from across the universe called fast radio bursts help astronomers catalog matter. ESO/M. Kornmesser, CC BY-SA Chris Impey, University of Arizona If you look across ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Chris Impey, University of Arizona (THE CONVERSATION) If you look across space with a ...