Beyond this protective layer lies space ... suggesting a finite yet unbounded structure. The observable universe—the part of space we can study—is limited by the speed of light and the ...

According to a tenet scientists call the cosmological principle, our place in space is in no way exceptional. But recent observations could overturn this long-held assumption ...

While parallel universes are a staple of science fiction, there are some real scientific theories to support them. But if ...

The observable universe is a ball-shaped region of the universe comprising ... No signal can travel faster than light, hence there is a maximum distance (called the particle horizon) beyond which ...