What does a black hole sound like? NASA has an answer

A bounty of black holes surround the Sagittarius A supermassive black hole which lies at the center of our Milky Way Galaxy. (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 and again.

NASA released a 35-second audio clip of the sound earlier this month using electromagnetic data picked from the Perseus Galaxy Cluster, some 240 million light-years away.