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 ...

The question of whether the cosmos goes on forever is no longer just a late night thought experiment, it is a live research problem that cuts to the heart of modern physics. Astrophysicists are using ...

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 ...

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 ...

The shape of the cosmos depends on a balance of two competing forces: the pull of gravity and the expansion driven by dark ...