Paul Sutter is an astrophysicist at The Ohio State University and the chief scientist at COSI Science Center. Sutter is also host of the podcasts Ask a Spaceman and RealSpace, and the YouTube series ...

The flat Earth conspiracy may not hold all that much water, but the universe might indeed be a lot flatter than you think. The idea of a geometrically flat, infinite universe is backed by Einstein's ...

Does the universe have an end or an edge? Scientists cannot definitively answer this question, but they have ideas, theories, and measurements to discuss. This question about the boundaries of the ...

Nearby, the stars and galaxies we see look very much like our own. But as we look farther away, we see the Universe as it was in the distant past: less structured, hotter, younger, and less evolved.

The observable universe is 92 billion light-years across and contains trillions of galaxies. Telescopes can only show us the observable universe; we can't see beyond it. The universe's shape is ...

If you were to go as far out into space as you can imagine, what would you encounter? Would there be a limit to how far you could go, or could you travel a limitless distance? Would you eventually ...

Lots of people believe the Universe is infinite, but there's a good possibility that might not be the case. Which means that there would be an actual edge of the Universe. What happens at that edge?

It is a routine emotion in 2019 to urgently wish, four or five times in a day, to be launched not simply into space but to the very edge of the universe, as far as it is possible to get from the fever ...

This story originally appeared in the December issue of Discover magazine as "Is the Universe Infinite?" Support our science journalism by becoming a subscriber. When Galileo Galilei pointed his first ...