The curious minds at What If examine overwriting Einstein’s theory of relativity with time travel, imagining paradoxes, ...

Like stretch marks left on skin that expanded too quickly or cracks embedded in freezing ice, cosmic strings are artifacts of ...

Add Yahoo as a preferred source to see more of our stories on Google. If traveling into the past is possible, one way to do it might be sending people through tunnels in space. by raggio5 via Pixabay ...

Can we journey through time? Sci-fi author Dete Meserve presents a compelling case for our future in the past. When you purchase through links on our site, we may earn an affiliate commission. Here’s ...

A trip through time has always sparked curiosity. The idea that you could step into a machine and emerge in the past or future has captured human imagination for generations. While science fiction ...