Since the detection of gravitational waves we know for sure that black holes do exist. To understand what really goes on inside them we need a new theory.
Physicists have discovered evidence that our Universe might be a giant hologram.
At the heart of modern physics lurks a terrible puzzle: the two main theories that describe the world we live in just won't fit together.
Space is the stage on which physics happens. It's unaffected by what happens in it and it would still be there if everything in it disappeared. This is how we learn to think about space at school. But the idea is as novel as it is out-dated.
The holy grail for 21st century physics is to produce a unified theory of everything that can describe the world at every level, from the tiniest particles to the largest galaxies. Currently the strongest contender for such a theory is something called M-theory. So what is this supposed mother of all theories all about?
Why can we remember the past and not the future? Why does time appear to move in only one direction when the laws of physics have no preferred direction in time? According to one physicist, it might be because we live in a bubble multiverse.