Dark energy—the term used to describe whatever is causing the universe to expand at an increasing rate—is one of the universe ...

For more than two decades, the standard model of cosmology has stood as a reliable guide to the universe. Known as Lambda ...

The universe is expanding, and while that fact is fascinating, it also creates a question that trips people up: if […] ...

That cosmologists cannot agree on one of the most elementary facts about the universe is striking enough. But that uncertainty produces others, too: it makes it impossible to calculate an exact age ...

People have been asking why space is dark despite being filled with stars for so long that this question has a special name – Olbers’ paradox. Astronomers estimate that there are about 200 billion ...

This article was originally published at The Conversation. The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights. Why didn’t the universe annihilate itself moments ...

NASA has set a 2030 deadline to build a 100-kilowatt nuclear reactor on the moon. It’s an ambitious but potentially achievable goal that could transform space exploration, experts tell WIRED.