Time travel is the stuff of fiction, of dreams. We all want to be able to either travel into the past to fix a wrong, or into the future to see what things would be. It comes as no surprise that scientists have also wondered if traveling through time is indeed possible according to our current understanding of the laws of physics. In this video from PBS spacetime, host Matt O'Dowd, explains the various ways in which theory allows us to travel through time. The most intuitive is...

The first-ever image of a black hole in space is here. This is quite a contradiction because nothing can escape a black hole, not even light, and without light we have no images. So how, then, can this be? First, let's talk about what a black hole is and how they are created. A black hole is created when a big-enough star dies and its mass collapses onto itself. The creation of a black hole is something difficult to comprehend. For example, suppose our Sun became a black...