It’s always amazing, and more than a little humbling, when the universe reminds us that our “common sense” is provincial, ...

Here’s what you’ll learn when you read this story: Mathematical evidence indicates that our universe is flat, but it could be infinitely big, as well. You can figure out if an object is flat with a ...

If you look across space with a telescope, you’ll see countless galaxies, most of which host large central black holes, ...