Way out on the edge of our solar system something big is lurking that has yet to be identified. Astronomers know it’s there because they can see the way other objects are affected by its ...

The first, very expensive, way to find a black hole in the solar system would be to send 100 specially-equipped spacecraft, as proposed by Edward Written, and Scott Lawrence and Zeeve Rogoszinski ...

But the black holes would have speeds of about 200 kilometers per second and come from outside the solar system. That’s rare for space rocks ( SN: 9/12/19 ).