Astronomers found a massive black hole that spent ages in a "quiet" phase when everything around it in the early universe ...

Astronomers have discovered a pair of young stars near the supermassive black hole at the heart of our galaxy. Studying them ...

Following is a transcript of the video. Narrator: The cosmos can be a dangerous place. Take black holes, for example. They're some of the most violent objects in our universe, powerful enough to ...