This article was originally published at The Conversation. The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights. About a century ago, scientists were struggling to ...

A novel theory suggests that the current expansion rate of the universe is not fixed, but was in fact quite different in the ...

About a century ago, scientists were struggling to reconcile what seemed like a contradiction in Albert Einstein's theory of general relativity. Published in 1915, and already widely accepted ...

Gravitational tsunamis exist and we’re on the verge of being able to detect them. There are cosmic events so powerful that they leave permanent marks on the fabric of the universe itself - a permanent ...

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Add Yahoo as a preferred source to see more of our stories on Google. About a century ago, scientists were struggling to reconcile what seemed a contradiction in Albert Einstein’s theory of general ...

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 ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Rob Coyne, University of Rhode Island (THE CONVERSATION) About a century ago, ...