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

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. This NASA/ESA Hubble Space Telescope image features the spiral galaxy Messier 77, also known as the Squid Galaxy. Everything on ...

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 ...

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, ...

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Doesn’t seem like much of a brainteaser, does it? Everyone knows the sky darkens at night because the sun sets … or more accurately, because our part of planet Earth rotates away from the sun, and ...

Depending on how you look at it, the universe might not have an "end," after all. This article was originally published at The Conversation. The publication contributed the article to Space.com's ...

About 13.8 billion years ago, the origin of the universe began with the Big Bang. Scientists say all space, time, matter, and ...

TimesMachine is an exclusive benefit for home delivery and digital subscribers. About the Archive This is a digitized version of an article from The Times’s print archive, before the start of online ...