Observations show the universe appears flat, yet its true size and global shape beyond the observable horizon may remain forever unknown.

Cosmologists increasingly suggest that the universe may be flat — and if that’s true, it could also be infinite. In an infinite universe, anything with a non-zero probability may occur somewhere, ...

Is the universe infinite? It's one of the most profound questions we can ask, and here's the short answer: We don't know. While we have learned a great deal about the universe, a portion of the cosmos ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. Where's the center of the ...

It looks so humdrum — a smear of black on a grey glass plate. Yet this negative, taken by US astronomer Edwin Hubble in 1923, highlighting a star in the Andromeda spiral galaxy, radically altered our ...

When you bake a loaf of bread or a batch of muffins, you put the dough into a pan. As the dough bakes in the oven, it expands into the baking pan. Any chocolate chips or blueberries in the muffin ...