Why this universe? Maybe not special – just possible

Cosmologists have spent For decades you’ve struggled to understand why the universe is so amazing. Not only is it smooth and flat as far as we can see, but it’s also expanding at an ever-increasingly slow pace, when naive calculations suggest that – out of the Big Bang – space should have been gravitationally collapsed … Read more

Are black holes time machines? Yes, but there is a problem

Black holes are natural time machines that allow travel to the past and the future. But don’t expect to be back to visit dinosaurs anytime soon. Right now, we don’t have a spacecraft that can bring us anywhere near a black hole. But even leaving those small details aside, trying to travel into the past … Read more