In the history of human civilization humans looked up at the sky and saw light. Now we can listen to the very fabric of space and time.
It is possible to observe a black hole from the comfort of your back yard.
Much of the light we observe from the region around a black hole is in the form of x-rays. Occasionally these x-rays will briefly flare up.
Observationally we know that black holes come in two sizes: stellar mass black holes with a mass of 5 – 10 Suns, and supermassive black holes with a mass of millions or billions of Suns. What we haven’t seen are medium sized black holes with masses of hundreds to thousands of Suns. We’ve long suspected they should exist, but proving it has been difficult. Now there’s strong evidence that these medium-sized black holes actually exist.
In August I wrote about evidence of a binary supermassive black hole in the center of a galaxy. Now there’s news of another binary in a different galaxy.
Stephen Hawking thinks he’s solved a long standing problem in physics known as the information paradox. But has he?
A supermassive black hole lurks in the center of our galaxy. But two supermassive black holes lurk in some galaxies.
Here’s the deal: nothing can travel faster than light. A black hole traps everything including light. So how does gravity escape a black hole?
There are some who would argue black holes haven’t yet been proven. In a way, they have a point.