What do you hear when you look into the night sky? If no one had ever seen a movie or television show about space, would we all imagine a different soundtrack in our minds? If there was a way to ...

NASA/CXC/Columbia Univ./C. Hailey et al. For the first time in history, earthlings can hear what a black hole sounds like: a low-pitched groaning, as if a very creaky heavy door was being opened again ...